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A292407
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Expansion of Product_{k>=1} ((1 - k^k*x^k)/(1 + k^k*x^k)).
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2
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1, -2, -6, -40, -386, -4952, -77116, -1406164, -29389570, -692122610, -18136684128, -523599632000, -16516245738140, -565284631133600, -20867650682241704, -826570263691236456, -34971594470460748146, -1574134630989710480092
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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) ~ -2*n^n * (1 - 2*exp(-1)/n - (exp(-1) + 6*exp(-2))/n^2). - Vaclav Kotesovec, Sep 16 2017
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MATHEMATICA
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nmax = 20; CoefficientList[Series[Product[(1 - k^k*x^k)/(1 + k^k*x^k), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Sep 16 2017 *)
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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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