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Search: id:A052819
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| 0, 1, 2, 15, 188, 3300, 74484, 2054864, 66998448, 2520581400, 107472778320, 5121576763512, 269759385873504, 15561785854196400, 975788232119245440, 66080957140527828480, 4806533577745476290304, 373724762062131412853760
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 784
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FORMULA
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E.g.f. satisfies: A(x + x*log(1-x)) = x. [From Paul D. Hanna (pauldhanna(AT)juno.com), Aug 28 2008]
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MAPLE
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spec := [S, {C=Sequence(B), B=Cycle(S), S=Prod(C, Z)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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PROGRAM
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(PARI) a(n)=n!*polcoeff(serreverse(x+x*log(1-x +x*O(x^n))), n) [From Paul D. Hanna (pauldhanna(AT)juno.com), Aug 28 2008]
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CROSSREFS
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Cf. A052802. [From Paul D. Hanna (pauldhanna(AT)juno.com), Aug 28 2008]
Sequence in context: A052857 A053492 A098343 this_sequence A127090 A046249 A042355
Adjacent sequences: A052816 A052817 A052818 this_sequence A052820 A052821 A052822
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KEYWORD
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easy,nonn
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AUTHOR
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encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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