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A069990
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(-1)^(n+1)/5*sum(k=1,2n,C(2n+1,k)*B(k)*5^k) where C(n,k) are the binomial coefficients, B(k) the Bernoulli numbers.
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0
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1, 15, 389, 17687, 1230957, 121576879, 16166877205, 2784640846791, 603078760252733, 160399574539581023, 51396542533525536741, 19528343388372578867575, 8681260357657270101974029
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..13.
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PROG
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(PARI) for(n=1, 25, print1(-(-1)^n*sum(i=1, 2*n, binomial(2*n+1, i)*bernfrac(i)*5^i)/5, ", "))
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CROSSREFS
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Sequence in context: A164323 A129615 A286139 * A157581 A143001 A250950
Adjacent sequences: A069987 A069988 A069989 * A069991 A069992 A069993
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre, May 01 2002
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STATUS
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approved
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