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A022616
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Expansion of Product_{m>=1} (1+q^m)^(-21).
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2
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1, -21, 210, -1351, 6426, -24780, 82845, -250806, 703731, -1853481, 4628337, -11052867, 25403952, -56451192, 121738767, -255623851, 524037507, -1051143723, 2066899387, -3990768663, 7577013360, -14163858895
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) ~ (-1)^n * 7^(1/4) * exp(Pi*sqrt(7*n/2)) / (2^(7/4) * n^(3/4)). - Vaclav Kotesovec, Aug 27 2015
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MATHEMATICA
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nmax = 50; CoefficientList[Series[Product[1/(1 + x^k)^21, {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Aug 27 2015 *)
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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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