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Search: id:A052859
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| 1, 0, 2, 6, 26, 150, 962, 6846, 54266, 471750, 4439762, 44911086, 485570186, 5581383990, 67890295202, 870493380126, 11726471352986, 165475293394470, 2439632685738482, 37491028556508366, 599285435979866666
(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 827
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FORMULA
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E.g.f.: exp(exp(x)^2-2*exp(x)+1)
Stirling transform of unsigned Hermite numbers: Sum_{k=0..n} Stirling2(n, k)*|HermiteH(k, 0)|. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 12 2003
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MAPLE
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spec := [S, {B=Prod(C, C), C=Set(Z, 1 <= card), S=Set(B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Cf. A067994.
Sequence in context: A132609 A125224 A052844 this_sequence A103937 A000629 A032187
Adjacent sequences: A052856 A052857 A052858 this_sequence A052860 A052861 A052862
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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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