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Search: id:A069988
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| A069988 |
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(-1)^(n+1)/6*sum(k=1,2n+1,C(2n+1,k)*B(k)*3^k) where C(n,k) are the binomial coefficients, B(k) the Bernoulli numbers. |
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+0
1
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| 0, 1, 8, 135, 3386, 120469, 5767884, 357666403, 27886211102, 2670067220337, 308003491726640, 42129829536116671, 6742323657098884098, 1248097176923675241805, 264614795104954119229076
(list; graph; listen)
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OFFSET
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1,3
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PROGRAM
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(PARI) for(n=1, 25, print1(-(-1)^n*sum(i=1, 2*n+1, binomial(2*n+1, i)*bernfrac(i)*3^i)/6, ", "))
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CROSSREFS
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Sequence in context: A128287 A003375 A007032 this_sequence A072072 A131927 A132869
Adjacent sequences: A069985 A069986 A069987 this_sequence A069989 A069990 A069991
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 01 2002
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