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Search: id:A052828
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| A052828 |
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A simple grammar: union of cycles and cycles of cycles. |
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+0
1
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| 0, 2, 3, 9, 41, 252, 1954, 18302, 200906, 2528152, 35862456, 565985472, 9834073248, 186504365616, 3833188731072, 84862243895088, 2013237501351504, 50950031663224320, 1370088133344414336
(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 793
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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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Union spec := [S, {B=Cycle(C), C=Cycle(Z), S=Union(C, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A095412 A074428 A125052 this_sequence A012972 A037389 A037425
Adjacent sequences: A052825 A052826 A052827 this_sequence A052829 A052830 A052831
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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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