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A098275 Coefficients in a simultaneous approximation to Li(2,-1) and Li(3,-1). 1

%I

%S 1,8,264,13040,778840,51955008,3725735664,281152383072,22035642730200,

%T 1778348612268800,146898506147371264,12366649337021296512,

%U 1057604322007893443056,91656070874708097813440

%N Coefficients in a simultaneous approximation to Li(2,-1) and Li(3,-1).

%H W. Zudilin, <a href="http://arXiv.org/abs/math.NT/0409023">Approximations to -, di and trilogarithms</a>

%F Sum[i=0..n, Sum[j=0..n C(n, i)^2*C(n, j)^2*C(n+i, n)*C(n+j, n)]].

%o (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)))

%Y Cf. A005258, A098274.

%K nonn,easy

%O 0,2

%A _Ralf Stephan_, Sep 03 2004

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Last modified October 16 18:03 EDT 2019. Contains 328102 sequences. (Running on oeis4.)