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Search: id:A052862
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| A052862 |
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E.g.f.: ln(-1/(-2+exp(x)))*x |
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+0
1
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| 0, 0, 2, 6, 24, 130, 900, 7574, 74928, 851274, 10916700, 155919742, 2453941512, 42188446898, 786563892660, 15805750451430, 340522975054176, 7829628493247002, 191363568551328780, 4954089147107164238
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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A simple grammar.
For n > 2, a(n) = (2*n + 4) * A000670(n-2). - Gerald McGarvey (gerald.mcgarvey(AT)comcast.net), Nov 01 2007
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 830
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MAPLE
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spec := [S, {B=Cycle(C), C=Set(Z, 1 <= card), S=Prod(Z, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A144167 A104983 A144251 this_sequence A129101 A013068 A082471
Adjacent sequences: A052859 A052860 A052861 this_sequence A052863 A052864 A052865
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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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