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A052835
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A simple grammar.
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0
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1, 2, 4, 16, 94, 718, 6698, 73512, 925944, 13149408, 207723792, 3611861856, 68535403440, 1409110979664, 31203828680880, 740391021216384, 18739539315968256, 503958517859488896, 14350254992824182912
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 802
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FORMULA
| E.g.f.: (-ln(-1/(-1+x))+ln(-1/(-1+x))^2-1)/(-1+ln(-1/(-1+x)))
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MAPLE
| spec := [S, {C=Sequence(B), B=Cycle(Z), S=Union(B, C)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A058136 A156335 A026089 * A009565 A009838 A088335
Adjacent sequences: A052832 A052833 A052834 * A052836 A052837 A052838
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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