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A269154
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Expansion of Product_{k>=1} (1 + k*x^k)/(1 + 2*x^k).
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2
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1, -1, 2, -3, 9, -13, 31, -53, 118, -210, 452, -866, 1793, -3493, 7119, -13992, 28257, -56253, 113035, -225318, 451745, -901870, 1805976, -3609701, 7222075, -14439594, 28887060, -57763494, 115540784, -231066845, 462154358, -924282660, 1848598423, -3697142099
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OFFSET
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0,3
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LINKS
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Vaclav Kotesovec, Table of n, a(n) for n = 0..3300
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FORMULA
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a(n) ~ c * (-2)^n, where c = Product_{k>=1} ((-2)^k + k)/((-2)^k - 1) = 0.4304067090888734207149852218007129877370867778815471457548443780472...
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MATHEMATICA
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nmax = 50; CoefficientList[Series[Product[(1+k*x^k)/(1+2*x^k), {k, 1, nmax}], {x, 0, nmax}], x]
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CROSSREFS
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Cf. A022629, A269144, A269153, A269155.
Sequence in context: A048744 A101234 A233190 * A358829 A225792 A057293
Adjacent sequences: A269151 A269152 A269153 * A269155 A269156 A269157
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KEYWORD
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sign
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AUTHOR
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Vaclav Kotesovec, Feb 20 2016
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STATUS
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approved
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