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A052834
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a(n) = Bell(n+1)-Bell(n)-1, n>0.
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0
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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; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 801
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FORMULA
| E.g.f.: exp(exp(x)-1)*exp(x)-exp(x)-exp(exp(x)-1)+1
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MAPLE
| 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
| Cf. A000110, A005493.
Sequence in context: A037521 A037730 A029874 * A150967 A121769 A006782
Adjacent sequences: A052831 A052832 A052833 * A052835 A052836 A052837
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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EXTENSIONS
| Better description from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 24 2003
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