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Search: id:A053525
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| A053525 |
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E.g.f.: (1-x)/(2-exp(x)). |
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+0
3
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| 1, 0, 1, 4, 23, 166, 1437, 14512, 167491, 2174746, 31374953, 497909380, 8619976719, 161667969646, 3265326093109, 70663046421208, 1631123626335707, 40004637435452866, 1038860856732399105, 28476428717448349996, 821656049857815980455
(list; graph; listen)
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OFFSET
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0,4
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REFERENCES
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R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.4(a).
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
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CROSSREFS
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a(n)=c(n)-n*c(n-1) where c() = A000670.
Cf. A005840.
Sequence in context: A007297 A111547 A158884 this_sequence A113869 A084357 A075729
Adjacent sequences: A053522 A053523 A053524 this_sequence A053526 A053527 A053528
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 15 2000
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