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Search: id:A141764
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| 1, 1, 5, 36, 336, 3863, 52944, 844777, 15411547, 316888806, 7258887646, 183464090374, 5074934980977, 152584140132667, 4956824851572271, 173086933804868142, 6467223731119047195, 257524741272166890188
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OFFSET
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0,3
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FORMULA
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G.f.: 1/(1-x) = Sum_{n>=0} a(n) * x^n/(1+x)^{(n+3)*(n+4)/2 - 6}.
a(n) = 1 - Sum_{j=0..n-1} a(j) * (-1)^(n-j) * C((j+3)(j+4)/2 + n-j-7, n-j) for n>0, with a(0)=1.
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PROGRAM
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(PARI) {a(n)=if(n==0, 1, 1 - sum(j=0, n-1, a(j)*(-1)^(n-j)*binomial((j+3)*(j+4)/2-6+n-j-1, n-j)))}
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CROSSREFS
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Cf. A141760, A141761, A141762, A141763.
Sequence in context: A067305 A000806 A127132 this_sequence A075744 A109186 A099391
Adjacent sequences: A141761 A141762 A141763 this_sequence A141765 A141766 A141767
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jul 18 2008
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