login
A069990
(-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.
0
1, 15, 389, 17687, 1230957, 121576879, 16166877205, 2784640846791, 603078760252733, 160399574539581023, 51396542533525536741, 19528343388372578867575, 8681260357657270101974029
OFFSET
1,2
PROG
(PARI) for(n=1, 25, print1(-(-1)^n*sum(i=1, 2*n, binomial(2*n+1, i)*bernfrac(i)*5^i)/5, ", "))
CROSSREFS
Sequence in context: A374000 A129615 A286139 * A157581 A143001 A373872
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, May 01 2002
STATUS
approved