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Search: id:A052809
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| A052809 |
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A simple grammar: number of cycles of cycles. |
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+0
1
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| 0, 0, 2, 6, 28, 175, 1368, 12838, 140656, 1762794, 24878320, 390495336, 6748280064, 127324033824, 2604355096224, 57404425654080, 1356401049662208, 34202807058719568, 916723959720053760
(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 771
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FORMULA
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E.g.f.: ln(-1/(-1+ln(-1/(-1+x))))*x
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MAPLE
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spec := [S, {B=Cycle(C), C=Cycle(Z), S=Prod(B, Z)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A156626 A088501 A140092 this_sequence A136631 A002435 A104018
Adjacent sequences: A052806 A052807 A052808 this_sequence A052810 A052811 A052812
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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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