OFFSET
1,1
COMMENTS
a(2m-1) is of the form 10k+1, a(2m) is of the form 10k+5
PROG
(PARI) a(n)=(-1)^(n+1)/(2*n+1)*sum(k=0, n, 64^k*bernfrac(2*k)*binomial(2*n+1, 2*k))
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Oct 19 2002
STATUS
approved