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Search: id:A107881
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| 1, 2, 3, 7, 26, 141, 1034, 9693, 111522, 1528112, 24372513, 444461496, 9135985760, 209223309377, 5286985099830, 146225910921737, 4395973641599418, 142794782804641965, 4985911547339049132, 186284207595651780174
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OFFSET
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0,2
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FORMULA
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G.f.: 1 = Sum_{k>=0} a(k)*x^k*(1-x)^(2 + k*(k-1)/2).
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EXAMPLE
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1 = 1*(1-x)^2 + 2*x*(1-x)^2 + 3*x^2*(1-x)^3 +
7*x^3*(1-x)^5 + 26*x^4*(1-x)^8 + 141*x^5*(1-x)^12 +...
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PROGRAM
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(PARI) {a(n)=polcoeff(1-sum(k=0, n-1, a(k)*x^k*(1-x+x*O(x^n))^(2+k*(k-1)/2)), n)}
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CROSSREFS
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Cf. A107880, A107882, A107883.
Sequence in context: A063852 A092983 A089708 this_sequence A128001 A052877 A137075
Adjacent sequences: A107878 A107879 A107880 this_sequence A107882 A107883 A107884
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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), Jun 04 2005
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