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Search: id:A052820
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| 1, 2, 9, 62, 572, 6604, 91526, 1480044, 27353448, 568731648, 13138994112, 333895239072, 9256507508112, 278000959058016, 8991458660924112, 311585506208924064, 11517363473843526912, 452332548042633835776
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 785
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FORMULA
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E.g.f.: -1/(-1+x+ln(-1/(-1+x)))
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MAPLE
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spec := [S, {C=Cycle(Z), B=Union(C, Z), S=Sequence(B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A006155 A121870 A113662 this_sequence A100262 A003577 A085928
Adjacent sequences: A052817 A052818 A052819 this_sequence A052821 A052822 A052823
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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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