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A207944
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Expansion of Product_{i>=1} (1 + x^(2*i + 1))/(1 - x^(2*i + 1)).
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2
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1, 0, 0, 2, 0, 2, 2, 2, 4, 4, 6, 6, 10, 10, 14, 18, 20, 26, 32, 38, 46, 58, 66, 82, 98, 116, 138, 166, 194, 230, 274, 318, 376, 442, 514, 602, 704, 814, 950, 1102, 1274, 1474, 1706, 1962, 2262, 2606, 2986, 3430, 3934, 4496, 5144, 5878, 6698, 7638, 8698, 9886
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OFFSET
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0,4
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REFERENCES
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George E. Andrews, Number Theory, Dover Publications, N.Y., 1971, 164-165.
Samuel I. Goldberg, Curvature and Homology, Dover, New York, 1998, 144.
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LINKS
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FORMULA
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a(n) ~ exp(sqrt(n/2)*Pi) * Pi / (2^(19/4) * n^(5/4)). - Vaclav Kotesovec, Apr 13 2017
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MATHEMATICA
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nmax = 50; CoefficientList[Series[Product[(1 + x^(2*k + 1))/(1 - x^(2*k + 1)), {k, 1, nmax}], {x, 0, nmax}], x] (* fixed by Vaclav Kotesovec, Apr 13 2017 *)
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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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