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A285472
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Expansion of Product_{k>=1} ((1 + x^(4*k)) / (1 - x^k)).
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1
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1, 1, 2, 3, 6, 8, 13, 18, 28, 38, 55, 74, 106, 140, 192, 253, 342, 444, 588, 758, 992, 1267, 1634, 2072, 2650, 3334, 4218, 5276, 6627, 8234, 10262, 12682, 15708, 19308, 23764, 29070, 35597, 43340, 52792, 64008, 77622, 93724, 113160, 136124, 163712, 196225
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) ~ sqrt(3) * exp(sqrt(3*n)*Pi/2) / (16*n).
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MATHEMATICA
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nmax = 50; CoefficientList[Series[Product[((1+x^(4*k))/(1-x^k)), {k, 1, nmax}], {x, 0, nmax}], x]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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