OFFSET
1,3
PROG
(PARI) for(n=1, 25, print1(-(-1)^n*sum(i=1, 2*n+1, binomial(2*n+1, i)*bernfrac(i)*3^i)/6, ", "))
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, May 01 2002
STATUS
approved