OFFSET
0,2
FORMULA
Column 1 of triangle A155812.
PROG
(PARI) {a(n)=polcoeff(polcoeff(exp(sum(m=1, n+1, (3^m+y)^m*x^m/m)+x*O(x^(n+1))), n+1, x), 1, y)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Feb 04 2009
STATUS
approved