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Search: id:A038084
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| A038084 |
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Number of n-node rooted identity trees of height at most 5. |
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+0
4
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| 1, 1, 1, 2, 3, 6, 11, 19, 31, 52, 85, 140, 228, 370, 594, 954, 1519, 2412, 3814, 6006, 9419, 14726, 22938, 35612, 55125, 85065, 130900, 200875, 307446, 469342, 714784, 1085956, 1646160, 2489838, 3757929, 5660110, 8508224, 12764585
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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There are 3211265 terms.
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LINKS
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N. J. A. Sloane, Transforms
Index entries for sequences related to rooted trees
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FORMULA
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Take Weigh transform of A038083 and shift right.
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MAPLE
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weigh:= proc(p) proc(n) `if`(n<0, 1, coeff (mul ((1+x^k)^p(k), k=1..n), x, n)) end end: wsh:= p-> n-> weigh(p)(n-1): a:= (wsh@@2) (n-> `if`(n>0 and n<12, [1$3, 2$5, 1$3][n], 0)): seq (a(n), n=1..38); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Sep 10 2008]
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CROSSREFS
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Cf. A038081-A038093.
Sequence in context: A004135 A090036 A024971 this_sequence A018169 A131269 A047081
Adjacent sequences: A038081 A038082 A038083 this_sequence A038085 A038086 A038087
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KEYWORD
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nonn,fini
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Jan 04 1999.
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