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Search: id:A052885
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| 0, 1, 4, 33, 424, 7445, 166176, 4505053, 143787904, 5282091081, 219531404800, 10184792907641, 521761503753216, 29254578504622237, 1781920872844693504, 117169936148978011125, 8272258025961978167296
(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 858
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FORMULA
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E.g.f.: RootOf(exp(_Z)*x*_Z+exp(_Z)*x-_Z)
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MAPLE
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spec := [S, {B=Prod(Z, C), C=Set(S), S=Sequence(B, 1<= card)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A156132 A111534 A162655 this_sequence A119821 A102321 A002190
Adjacent sequences: A052882 A052883 A052884 this_sequence A052886 A052887 A052888
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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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