traffic light problem: A006043 , A006044
trailing zeros in n!: A027868
trails: A006817 A006818 A006819 A006851
transform, hyperbinomial: see hyperbinomial transform A088956
transformations on unit interval: A002823
translation planes: A007375 *
transposable numbers, sequences related to (start):
transposable numbers: A087502 : when move R digit to L, doubles (in base n)
transposable numbers: A092697 : when move R digit to L, multiplies by n (finite)
transposable numbers: A094676 : when move L digit to R, divides by n, no. of digits is unchanged (finite)
transposable numbers: A097717 : when move L digit to R, divides by n (infinite)
transposable numbers: A128857 is the same sequence as A097717 except that m must begin with 1.
transposable numbers: A146088 : when move R digit to L, doubles (in base 10)
transpositions: A001540 A013927 A029697 A029698 A029699 A029700 A051864 A055091
tree, Stern-Brocot, see Stern-Brocot tree
tree, unary-binary, definition: A029766
trees , sequences related to (start):
trees , see also rooted trees
trees , A000055 * (unlabeled), A000272 * (labeled), A000081 * (rooted unlabeled)
trees, 2-colored, A004114 , A007141 , A007143 , A036251 , A038054 , A038056 *, A038058 *, A038078 , A052317
trees, 3-colored, A007142 , A007144 , A036252 , A038060 *, A038062 *, A038080
trees, 3-valent, A000672 *, A000673 , A000675 , A003692 , A006570 , A036361 , A036362 , A036363
trees, 4-valent, see trees, quartic
trees, 5-valent, A036648 , A036649 , A036650 *
trees, 6-valent, A036651 , A036652 , A036653 *
trees, achiral, A005629 *, A005627 , A003244 , A003243 , A003237 , A003241 , A003240
trees, alternating, A007889
trees, asymmetric, A000220 *, A005354 , A005755 , A038078 , A038080 , A048828 , A052303 , A052326 , A055334 -A055339
trees, automorphism group of, A001013
trees, average height of rooted labeled: A000435 *
trees, balanced ordered, A007059
trees, balanced, A006265
trees, bicentered, A000200 , A000673 , A000677 *, A036649 , A036652
trees, binary rooted: A002572 *, A001190 *
trees, binary rooted: see also A002844
trees, binary, see also: trees, 3-valent
trees, binary: A000672 *, A001699 *, A002572 *, A001190 *, A006223
trees, bisectable, A007098
trees, boron, A000671 *, A000672 *, A000673 *, A000675 *
trees, boron, see also trees, 3-valent
trees, by diameter, A000094 , A001851 , A000147 , A000251 , A000550 , A000306 , A000551 , A001852 , A000554 , A000552 , A000555 , A000553
trees, by height, A001383 , A001384 , A001385 , A002658 , A001854 , A001864 , A000235 , A001853 , A000299 , A001863 , A000342 , A000393 , A000418 , A000429 , A000435
trees, by stability index, A003428 , A003427 , A003429
trees, by valency, A006570
trees, carbon, A000678 , A005962
trees, centered, A000022 , A000675 , A000676 *, A036648 , A036651
trees, chiral, A005628 , A005630 *
trees, codes for, A005517 , A005518
trees, complexity, A036988
trees, constant, A051491 , A051492 , A051496
trees, coordination sequence, A003945 -A003954
trees, diameter 3, A000554 *
trees, diameter 4, A000094 *, A000555 *
trees, diameter 5, A000147 *
trees, diameter 6, A000251 *
trees, diameter 7, A000550 *
trees, diameter 8, A000306 *
trees, diameter of, A001851 , A001852 , A048828
trees, directed, A006965 , A006964
trees, E-type, A007141 , A007142 , A007143 , A007144
trees, endpoints, A003228 , A003227
trees, endpoints, see trees, leaves
trees, evolutionary, A007151 , A007152
trees, exchange, A007905
trees, exponentiation of e.g.f., A006790
trees, fat: A055779
trees, fixed points in, A005200 , A005202 , A005201
trees, free, A000672 , A005588
trees, graceful, A033472
trees, Greg, A005263 *, A005264 , A048160 *, A048159 , A052302 *, A052303
trees, H*-palindromic, A051174
trees, heap ordered, A001059
trees, hexagon, A004127
trees, homeomorphically irreducible: see trees, series-reduced
trees, Husimi, A000083 , A000314 , A035351 , A035352 , A035353 , A035356 , A035357 , A035085 *, A035088 *
trees, identity: see trees, asymmetric
trees, in wheel, A002985
trees, indecomposable: A124593
trees, intransitive, A007889
trees, labeled, A001258 , A007106
trees, leaves, (cont.): A055541
trees, leaves, A003228 , A055290 *, A055291 -A055301 , A055314 *, A055315 -A055324 , A055334 -A055339
trees, Leech labeling problem, A007187
trees, leftist, A006196 *
trees, log of e.g.f., A006802
trees, M-type, A006959
trees, matched, A005751 , A005753 , A005754 , A005750 , A005755
trees, nodes, A055543
trees, of subsets, A005173 , A005174 , A005175 , A005640 , A005805 , A036250 *, A038052 *
trees, oriented, A000151 , A000238 , A000238 *, A007748 , A007835
trees, partially labeled, A000107 , A000524 , A000243 , A000269 , A000444 , A000485 , A000525 , A000526
trees, path length, A027874
trees, permutation, A005355
trees, phylogenetic: A000311 *, A005805 , A006677 , A005804 , A005640 , A006679 , A006681 , A006682 , A006678 , A006680
trees, planar, A002995 *, A003092 , A003093 , A005354 , A006241 , A006963 , A006082 , A006080 , A003239 , A001895 , A006081 , A006079
trees, planar, A106363
trees, plane: see trees, planar
trees, planted: see rooted trees
trees, powers of g.f., A000106 , A000242 , A000300 , A000343 , A000395 , A000439 , A000529 , A006706
trees, projective plane, A006079 , A006080 , A006081 , A006082
trees, quartic: A000022 , A000200 , A000602 *, A010372 , A010373 , A036506 , A000598 *
trees, Ramsey theorem for: A004401
trees, reversion of g.f., A007315 , A037247 *
trees, rooted: A000081 * (unlabeled), A000169 * (labeled)
trees, rooted: see also rooted trees
trees, rotation distance between, A005152
trees, Schroeder, A010683
trees, search, see: rooted trees, search
trees, series-reduced: A000014 *, A000311 *, A005512 *, A059123 *, A007827 *, A002792 *, A007831 , A062136 , A034851 , A064060
trees, shapes of: A006265
trees, signed, A000060
trees, spanning (1): A003690 , A003691 , A003696 , A003733 , A003734 , A003739 , A003740 , A003745 , A003746 , A003751 , A003753 , A003755
trees, spanning (2): A003756 , A003761 , A003762 , A003767 , A003768 , A003773 , A003774 , A003779 , A003780 , A005822 , A006237 , A006238
trees, spanning (3): A007725 , A007726 , A020871 , A030019
trees, spectra of, A006610
trees, squares of, A001256
trees, stability index of, A003427 , A003428 , A003429
trees, stable, A003426
trees, Steiner, A011798
trees, steric, A000628 , A000625
trees, symmetries in, A003612 , A003616 , A003609 , A003610 , A003614 , A003611 , A007136 , A003615 , A007135 , A003613
trees, ternary, A001764 *, A002707 *
trees, triangle of, A034799 , A034800
trees, trimmed, A002988 *, A052320 *, A002955
trees, trimmed, see also: trees, with a forbidden limb
trees, two-colored, A004114 , A004113
trees, Weiner index, A051175
trees, with a forbidden limb, A002990 , A002991 , A002992 , A002989 , A014265 , A014266 , A014270 -A014274 , A014277 -A014281 , A052320 , A052323 , A052326
trees, with bicentroid, A010373 , A000677 *
trees, with centroid, A010372 , A000676 *
trees: see also rooted trees
trees: see also A007830 , A066319