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Search: id:A069992
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| A069992 |
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(-1)^(n+1)/3*sum(k=1,2n,C(2n+1,k)*B(k)*6^k) where C(n,k) are the binomial coefficients, B(k) the Bernoulli numbers. |
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+0
1
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| 3, 57, 2123, 138609, 13883283, 1974243241, 378027128283, 93761532169953, 29240923237509923, 11199084302796542745, 5167442341466021937003, 2827285169201754895553617, 1809878752362221218378054323
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) for(n=1, 25, print1(-(-1)^n*sum(i=1, 2*n, binomial(2*n+1, i)*bernfrac(i)*6^i)/3, ", "))
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CROSSREFS
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Sequence in context: A053725 A053774 A009723 this_sequence A012196 A012090 A012064
Adjacent sequences: A069989 A069990 A069991 this_sequence A069993 A069994 A069995
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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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