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Search: id:A088313
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| A088313 |
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Number of "sets of lists" (cf. A000262) with an odd number of lists. |
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+0
2
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| 1, 2, 7, 36, 241, 1950, 18271, 193256, 2270017, 29272410, 410815351, 6231230412, 101560835377, 1769925341366, 32838929702671, 646218442877520, 13441862819232001
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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N. Heninger, E. M. Rains and N. J. A. Sloane, On the Integrality of n-th Roots of Generating Functions, J. Combinatorial Theory, Series A, 113 (2006), 1732-1745.
N. J. A. Sloane, LAH transform
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FORMULA
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E.g.f.: sinh(x/(1-x)). a(n) = Sum_{k=1.. floor((n+1)/2)} n!/(2*k-1)!*binomial(n-1, 2*k-2).
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CROSSREFS
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Cf. A027187, A024429, A024430, A001710, A109777.
Sequence in context: A019030 A119736 A088715 this_sequence A095793 A029768 A007889
Adjacent sequences: A088310 A088311 A088312 this_sequence A088314 A088315 A088316
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 05 2003
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