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 A098275 Coefficients in a simultaneous approximation to Li(2,-1) and Li(3,-1). 1
 1, 8, 264, 13040, 778840, 51955008, 3725735664, 281152383072, 22035642730200, 1778348612268800, 146898506147371264, 12366649337021296512, 1057604322007893443056, 91656070874708097813440 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS W. Zudilin, Approximations to -, di and trilogarithms FORMULA Sum[i=0..n, Sum[j=0..n C(n, i)^2*C(n, j)^2*C(n+i, n)*C(n+j, n)]]. PROG (PARI) a(n)=sum(i=0, n, sum(j=0, n, binomial(n, i)^2*binomial(n, j)^2*binomial(n+i, n)*binomial(i+j, i))) CROSSREFS Cf. A005258, A098274. Sequence in context: A081058 A003386 A299328 * A221606 A230590 A300047 Adjacent sequences:  A098272 A098273 A098274 * A098276 A098277 A098278 KEYWORD nonn,easy AUTHOR Ralf Stephan, Sep 03 2004 STATUS approved

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Last modified July 22 10:03 EDT 2019. Contains 325219 sequences. (Running on oeis4.)