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A185756
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Column 1 of triangle A185755.
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4
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2, 15, 154, 1995, 31191, 571221, 11992688, 283976517, 7487521975, 217567092743, 6907888374828, 237951469523807, 8838510559556783, 352160268261051113, 14982705940607112640, 677935029521206050505, 32508195354031791206799
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OFFSET
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1,1
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COMMENTS
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Column 0 of triangle A185755 equals n^(n-1).
A185755(n,k) equals the coefficient of x^n*y^k in the n-th iteration of x*(1+xy)/(1-x).
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LINKS
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Table of n, a(n) for n=1..17.
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PROG
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(PARI) {a(n)=local(A=x, G=x*(1+x*y)/(1-x)); for(i=1, n+1, A=subst(G, x, A+O(x^(n+2)))); polcoeff(polcoeff(A, n+1, x), 1, y)}
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CROSSREFS
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Cf. A185755, A185757, A185758, A185759.
Sequence in context: A060226 A002103 A191364 * A124548 A139085 A204679
Adjacent sequences: A185753 A185754 A185755 * A185757 A185758 A185759
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna, Feb 03 2011
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STATUS
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approved
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