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Search: id:A052864
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| 0, 0, 2, 12, 82, 670, 6458, 72072, 915864, 13068768, 206998032, 3604604256, 68455569840, 1408152976464, 31191374639280, 740216664633984, 18736923967232256, 503916672279712896, 14349543617967990912
(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 832
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FORMULA
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E.g.f.: -ln(-1/(-1+x))^2/(-1+ln(-1/(-1+x)))
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MAPLE
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spec := [S, {C=Cycle(Z), B=Sequence(C, 1 <= card), S=Prod(B, C)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Cf. A009122.
Sequence in context: A058872 A055548 A092850 this_sequence A130464 A006657 A105927
Adjacent sequences: A052861 A052862 A052863 this_sequence A052865 A052866 A052867
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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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