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Search: id:A052886
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| 0, 1, 3, 19, 207, 3211, 64383, 1581259, 45948927, 1541641771, 58645296063, 2494091717899, 117258952478847, 6038838138717931, 338082244882740543, 20443414320405268939, 1327850160592214291967, 92200405122521276427691
(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 859
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FORMULA
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E.g.f.: 1/2-1/2*(5-4*exp(x))^(1/2)
a(n) = 1+Sum_{k=1..n-1} binomial(n, k)*a(k)*a(n-k). - Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 02 2005
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MAPLE
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spec := [S, {C=Set(Z, 1 <= card), S=Prod(B, C), B=Sequence(S)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A127502 A027546 A108993 this_sequence A079144 A049056 A165356
Adjacent sequences: A052883 A052884 A052885 this_sequence A052887 A052888 A052889
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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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