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A350583
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Coefficients of the expansion of Sum_{n,m>=1} (-1)^m*q^(2*n*m+m)/((1+q^n)*(1-q^(2*m-1))) (odd powers only).
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0
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-1, -2, -3, -5, -4, -7, -9, -6, -11, -11, -11, -14, -15, -12, -15, -24, -14, -21, -20, -16, -30, -25, -20, -27, -31, -22, -33, -31, -25, -36, -44, -28, -30, -43, -26, -50, -43, -37, -47, -40, -38, -51, -53, -34, -53, -62, -38, -55, -63, -36, -74, -58, -42, -54, -64, -65, -69, -71
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OFFSET
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1,2
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COMMENTS
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It is conjectured that only odd powers appear in this expansion.
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LINKS
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EXAMPLE
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G.f. = -q^3 -2*q^5 -3*q^7 -5*q^9 -4*q^11 -7*q^13 -9*q^15 -6*q^17 -11*q^19 ...
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PROG
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(PARI) lista(nn) = my(v=Vec(sum(n=1, nn, sum(m=1, nn, (-1)^m*q^(2*n*m+m)/((1+q^n)*(1-q^(2*m-1))))) + O(q^(2*nn)))); vector(#v\2, k, v[2*k-1]);
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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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