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A052853
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A simple grammar.
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0
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0, 1, 2, 5, 14, 42, 138, 466, 1643, 5919, 21773, 81279, 307483, 1175352, 4534161, 17626999, 68992703, 271641249, 1075144364, 4275274867, 17071822275
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 821
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MAPLE
| spec := [S, {C=Prod(Z, B), S=Cycle(C), B=Set(S)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A149876 A165146 A148331 * A149877 A149878 A148332
Adjacent sequences: A052850 A052851 A052852 * A052854 A052855 A052856
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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