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A022680
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Expansion of Product_{m>=1} (1-m*q^m)^20.
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2
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1, -20, 150, -400, -875, 7396, -7770, -36600, 56510, 154660, -872, -1314200, -455605, 6284960, 3781830, -9954864, -43558410, -16664680, 165132890, 229738040, 57372644, -1326447180, -2095012310, 1723402120, 7805180205
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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)^20, {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)^20)) \\ G. C. Greubel, Jul 18 2018
(Magma) Coefficients(&*[(1-m*x^m)^20: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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