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Search: id:A052892
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| 0, 1, 3, 22, 269, 4606, 101407, 2728818, 86783769, 3184595686, 132443395091, 6156200036746, 316272966462565, 17795937622944846, 1088410048965734055, 71893314170319604066, 5100574859506418167601, 386824334429004242804086
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 868
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FORMULA
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E.g.f.: exp(RootOf(-2*_Z+_Z*exp(x*_Z)+1)*x)-1
G.f.: x*Sum_{k>0} 1/(2-k*x)^k. - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 23 2006
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MAPLE
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spec := [S, {C=Prod(Z, B), S=Set(C, 1 <= card), B=Sequence(S)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A054595 A054594 A005264 this_sequence A155806 A074706 A141360
Adjacent sequences: A052889 A052890 A052891 this_sequence A052893 A052894 A052895
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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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