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A022649
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Expansion of Product_{m >=1} (1+m*q^m)^21.
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2
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1, 21, 252, 2275, 17052, 111594, 657419, 3557256, 17931459, 85093393, 383211885, 1648114587, 6803773998, 27073141326, 104199172863, 389047640905, 1412682672765, 4999550830281, 17277525329491, 58400376126855, 193361098926450, 627924447630011, 2002332877504113
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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+m*q^m)^21, {m, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Mar 20 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)^21)) \\ G. C. Greubel, Mar 20 2018
(Magma) Coefficients(&*[(1+m*x^m)^21:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Mar 20 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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