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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
OFFSET
0,2
FORMULA
a(n) = Sum_{i=0..n} Sum_{j=0..n} C(n, i)^2*C(n, j)^2*C(n+i, n)*C(i+j, i).
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
Sequence in context: A081058 A003386 A299328 * A326920 A221606 A230590
KEYWORD
nonn,easy
AUTHOR
Ralf Stephan, Sep 03 2004
STATUS
approved