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 A120283 Numerator of the coefficients of the k^2 terms of Sum[Sum[(i+j)^(2n),{i,1,k}],{j,1,k}]. 0
 5, 1, -5, 7, -15, 7601, -91, 3617, -745739, 3317609, -5981591, 5436374093, -213827575, 213745149261, -249859397004145, 238988952277727, -28354566442037, 26315271553053477373, -108409774812137683, 3394075340453838586663 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..20. FORMULA 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). MATHEMATICA Numerator[Coefficient[Table[Sum[Sum[(i+j)^(2n), {i, 1, k}], {j, 1, k}], {n, 1, 20}], k, 2]] CROSSREFS Cf. A100615, A027643. Sequence in context: A338167 A129769 A129766 * A103986 A196404 A128359 Adjacent sequences: A120280 A120281 A120282 * A120284 A120285 A120286 KEYWORD frac,sign AUTHOR Alexander Adamchuk, Jul 06 2006 STATUS approved

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Last modified September 30 21:59 EDT 2023. Contains 365812 sequences. (Running on oeis4.)