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A113664
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Self-convolution 4th power of A113670, where a(n) = A113670(n+1)/(n+1).
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9
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1, 4, 38, 556, 10745, 254700, 7100444, 226687964, 8138624340, 324257974800, 14191562670382, 676772204063828, 34931592000218062, 1940427169943222088, 115440543670528170360, 7323969420842077029820, 493653199877341017573868
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f. satisfies: A(x) = (1 + x*d/dx[x*A(x)] )^4.
a(n) ~ c * 4^n * n! * n^(3/4), where c = 0.71282302257258522141135342... - Vaclav Kotesovec, Oct 23 2020
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PROG
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(PARI) {a(n)=local(A=1+x*O(x^n)); for(i=1, n, A=(1+x*deriv(x*A))^4); polcoeff(A, n, x)}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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