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A052858
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A simple grammar.
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0
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0, 0, 2, 3, 16, 65, 456, 3157, 28624, 276705, 3136240, 38531141, 528468744, 7837577761, 126588882616, 2194957583925, 40854219413536, 810192673705793, 17082845929433952, 381225135102420997
(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 826
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FORMULA
| E.g.f.: ln(-1/(-1+x*exp(x)-x))
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MAPLE
| spec := [S, {B=Set(Z, 1 <= card), C=Prod(Z, B), S=Cycle(C)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A012705 A103331 A052506 * A191416 A073997 A007118
Adjacent sequences: A052855 A052856 A052857 * A052859 A052860 A052861
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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