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Search: id:A052848
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| 1, 0, 2, 3, 28, 125, 1146, 8827, 94200, 1007001, 12814390, 172114151, 2584755636, 41436880069, 721702509906, 13397081295795, 266105607506416, 5605474012933169, 125164378600050798, 2948082261121889983
(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 816
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FORMULA
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E.g.f.: -1/(-1+x*exp(x)-x)
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MAPLE
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spec := [S, {B=Prod(Z, C), C=Set(Z, 1 <= card), S=Sequence(B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A009249 A012697 A001094 this_sequence A126266 A003017 A096580
Adjacent sequences: A052845 A052846 A052847 this_sequence A052849 A052850 A052851
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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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