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Search: id:A055512
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| A055512 |
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Lattices with n labeled elements. |
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+0
5
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| 1, 1, 2, 6, 36, 380, 6390, 157962, 5396888, 243179064, 13938711210, 987858368750, 84613071940452, 8597251494954564, 1020353444641839854, 139627532137612581090, 21788453795572514675760, 3840596246648027262079472, 758435490711709577216754642
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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D. J. Kleitman and K. J. Winston, The asymptotic number of lattices, in: Combinatorial mathematics, optimal designs and their applications (Proc. Sympos. Combin. Math. and Optimal Design, Colorado State Univ., Fort Collins, Colo., 1978), Ann. Discrete Math. 6 (1980), 243-249.
J. Heitzig and J. Reinhold, Counting finite lattices, Algebra Universalis, 48 (2002), 43-53.
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LINKS
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David Wasserman, Table of n, a(n) for n = 0..18
J. Heitzig and J. Reinhold, Counting finite lattices, preprint no. 298, Institut fuer Mathematik, Universitaet Hanover, Germany, 1999.
Index entries for "core" sequences
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CROSSREFS
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Cf. A006966, A001035. Main diagonal of A058159.
Sequence in context: A133822 A133892 A089709 this_sequence A078973 A152480 A001660
Adjacent sequences: A055509 A055510 A055511 this_sequence A055513 A055514 A055515
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KEYWORD
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core,hard,nonn
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AUTHOR
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Jobst Heitzig (heitzig(AT)math.uni-hannover.de), Jul 03 2000
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