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 A273698 Denominators of expansion of PolyLog(-2, x)/PolyLog(2, x), where PolyLog(m, x) is the polylogarithm function. 1
 1, 4, 144, 576, 518400, 2073600, 3657830400, 696729600, 13168189440000, 52672757760000, 45888506560512000, 917770131210240000, 6840049010896797696000000, 1013340594206932992000000, 984967057569138868224000000, 562838318610936496128000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Denominators of expansion of (Sum_{k>=1} x^k*k^2)/(Sum_{k>=1} x^k/k^2). Denominators of numbers for which convolution with Sum_{k=1..n} 1/k^2 = A007406(n)/A007407(n) gives Sum_{k=1..n} k^2 = A000330(n). LINKS Eric Weisstein's World of Mathematics, Dilogarithm, Polylogarithm, and Wolstenholme Number EXAMPLE 1, 15/4, 1145/144, 7795/576, 10605889/518400, 59526571/2073600, 139954552433/3657830400, 34217723087/696729600, 806539298609929/13168189440000, ... MATHEMATICA Table[Denominator[SeriesCoefficient[PolyLog[-2, x]/PolyLog[2, x], {x, 0, n}]], {n, 0, 15}] CROSSREFS Cf. A232193 (numerators of expansion of PolyLog(-1, x)/PolyLog(1, x)), A232248 (denominators of expansion of PolyLog(-1, x)/PolyLog(1, x)). Cf. A000330, A007406, A007407, A266581 (numerators). Sequence in context: A053891 A053897 A017294 * A134631 A036511 A263386 Adjacent sequences:  A273695 A273696 A273697 * A273699 A273700 A273701 KEYWORD nonn,frac AUTHOR Ilya Gutkovskiy, May 28 2016 STATUS approved

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Last modified January 18 20:57 EST 2019. Contains 319282 sequences. (Running on oeis4.)