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A120283
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Numerator of the coefficients of the k^2 terms of Sum[Sum[(i+j)^(2n),{i,1,k}],{j,1,k}].
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0
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5, 1, -5, 7, -15, 7601, -91, 3617, -745739, 3317609, -5981591, 5436374093, -213827575, 213745149261, -249859397004145, 238988952277727, -28354566442037, 26315271553053477373, -108409774812137683, 3394075340453838586663
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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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a(n) = numerator[Coefficient[Sum[Sum[(i+j)^(2n),{i,1,k}],{j,1,k}],k,2]]. a(n) = A100615(2n) - bisection of the numerators of B(n)(2).
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MATHEMATICA
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Numerator[Coefficient[Table[Sum[Sum[(i+j)^(2n), {i, 1, k}], {j, 1, k}], {n, 1, 20}], k, 2]]
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CROSSREFS
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KEYWORD
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frac,sign
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AUTHOR
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STATUS
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approved
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