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Search: id:A052826
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| A052826 |
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A simple grammar: product of cycles and cycles of cycles. |
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+0
1
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| 0, 0, 2, 9, 48, 315, 2497, 23394, 254132, 3149826, 43945354, 682314028, 11676044036, 218402171520, 4433885571840, 97098961376112, 2281563329170752, 57255174735315792, 1528204674443305680
(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 791
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FORMULA
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E.g.f.: ln(-1/(-1+x))*ln(-1/(-1+ln(-1/(-1+x))))
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MAPLE
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spec := [S, {B=Cycle(C), C=Cycle(Z), S=Prod(C, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A118341 A100427 A074143 this_sequence A115599 A000167 A109323
Adjacent sequences: A052823 A052824 A052825 this_sequence A052827 A052828 A052829
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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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