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A228903
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A diagonal of triangle A228902.
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1
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1, 3, 45, 2905, 411500, 100545716, 37614371968, 19977489354808, 14291976911388733, 13248449270832615473, 15445843697030022753539, 22118947642938636936616739, 38166279965353127309979185861, 78098472647949324804924786089941, 186993874842690500015923551395259661
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OFFSET
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1,2
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COMMENTS
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Triangle A228902 is defined by g.f.: exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k^2) * y^k ).
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LINKS
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PROG
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(PARI) {a(n)=polcoeff(polcoeff(exp(sum(m=1, n, x^m/m*sum(j=0, m, binomial(m^2, j^2)*y^j))+x*O(x^n)), n, x), n-1, y)}
for(n=1, 20, print1(a(n), ", "))
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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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