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Search: id:A052834
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| A052834 |
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a(n) = Bell(n+1)-Bell(n)-1, n>0. |
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+0
1
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| 0, 0, 2, 9, 36, 150, 673, 3262, 17006, 94827, 562594, 3535026, 23430839, 163254884, 1192059222, 9097183601, 72384727656, 599211936354, 5150665398897, 45891416030314, 423145657921378
(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 801
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FORMULA
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E.g.f.: exp(exp(x)-1)*exp(x)-exp(x)-exp(exp(x)-1)+1
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MAPLE
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spec := [S, {B=Set(Z, 1 <= card), C=Set(B, 1 <= card), S=Prod(B, C)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Cf. A000110, A005493.
Sequence in context: A037521 A037730 A029874 this_sequence A150967 A121769 A006782
Adjacent sequences: A052831 A052832 A052833 this_sequence A052835 A052836 A052837
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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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EXTENSIONS
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Better description from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 24 2003
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