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A327686
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Expansion of Product_{k>=1} 1/(1 + x^k/(1 + x^(2*k)/(1 + x^(3*k)))).
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3
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1, -1, 0, 0, -1, 0, 1, 0, 0, 0, -1, 0, 2, 0, 0, -1, 0, 1, 0, -2, -2, 4, 1, 0, 1, -6, 2, 3, -2, -2, -2, 2, 3, 2, -1, -3, 3, -1, -1, 0, -7, 3, 7, -4, 0, 1, -1, 3, 4, -5, -3, 5, -3, -3, 5, -3, 0, 3, -8, -3, 11, -3, 1, 7, -5, 12, -2, -17, -3, 5, 9, -12, 6, -12, -1, 34, -26
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OFFSET
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0,13
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LINKS
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MATHEMATICA
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m = 76; CoefficientList[Series[Product[1/(1 + x^k/(1 + x^(2*k)/(1 + x^(3*k)))), {k, 1, m}], {x, 0, m}], x] (* Amiram Eldar, May 06 2021 *)
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PROG
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(PARI) N=66; x='x+O('x^N); Vec(1/prod(k=1, N, 1+x^k/(1+x^(2*k)/(1+x^(3*k)))))
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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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