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A069991 (-1)^(n+1)/14*sum(k=1,2n,C(2n+1,k)*B(k)*7^k) where C(n,k) are the binomial coefficients, B(k) the Bernoulli numbers. 0
1, 24, 1211, 107426, 14639841, 2833334908, 738420667591, 249285306765270, 105817142655593261, 55162112425933979312, 34643962156837119237651, 25799726424152610741805834, 22479598186937674926509533561 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

PROG

(PARI) for(n=1, 25, print1(-(-1)^n*sum(i=1, 2*n, binomial(2*n+1, i)*bernfrac(i)*7^i)/14, ", "))

CROSSREFS

Sequence in context: A144618 A042107 A042104 * A035025 A074652 A188807

Adjacent sequences:  A069988 A069989 A069990 * A069992 A069993 A069994

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, May 01 2002

STATUS

approved

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Last modified April 11 18:00 EDT 2021. Contains 342888 sequences. (Running on oeis4.)