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A297326
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a(n) = [x^n] Product_{k>=1} 1/(1 + k*x^k)^n.
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6
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1, -1, -1, -1, 27, -76, 95, -295, 2035, -8119, 22714, -66793, 254223, -988651, 3444055, -11402626, 39248691, -141740051, 511583207, -1798826901, 6256648862, -22054706773, 78889160635, -281698897727, 996551999479, -3520566280801, 12522382445455, -44731559517301
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OFFSET
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0,5
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LINKS
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FORMULA
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MAPLE
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f:= proc(n) local k;
coeff(series(mul(1/(1+k*x^k)^n, k=1..n), x, n+1), x, n);
end proc:
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MATHEMATICA
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Table[SeriesCoefficient[Product[1/(1 + k x^k)^n, {k, 1, n}], {x, 0, n}], {n, 0, 27}]
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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