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A022678
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Expansion of Product_{m>=1} (1-m*q^m)^18.
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2
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1, -18, 117, -222, -936, 4680, -951, -23634, 4815, 89692, 170019, -583992, -1009011, 1753434, 3755619, 3911748, -16001739, -35135352, 6931209, 99524520, 287076168, -92384118, -969330771, -1271547612, -41096046
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nmax = 50}, CoefficientList[Series[Product[(1 - k*q^k)^18, {k, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Jul 18 2018 *)
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PROG
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(PARI) m=50; q='q+O('q^m); Vec(prod(n=1, m, (1-n*q^n)^18)) \\ G. C. Greubel, Jul 18 2018
(Magma) Coefficients(&*[(1-m*x^m)^18:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Jul 18 2018
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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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