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A038064
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Product_{k>=1} 1/(1 - x^k)^a(k) = 1 + 3x.
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7
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3, -6, 8, -18, 48, -124, 312, -810, 2184, -5928, 16104, -44220, 122640, -341796, 956576, -2690010, 7596480, -21524412, 61171656, -174336264, 498111952, -1426419852, 4093181688, -11767874940, 33891544368, -97764131640
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OFFSET
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1,1
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LINKS
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FORMULA
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G.f.: Sum_{n>=1} moebius(n)*log(1 + 3*x^n)/n, where moebius(n)=A008683(n). - Paul D. Hanna, Oct 13 2010
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PROG
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(PARI) {a(n)=polcoeff(sum(k=1, n, moebius(k)/k*log(1+3*x^k+x*O(x^n))), n)} \\ Paul D. Hanna, Oct 13 2010
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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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