OFFSET
0,2
COMMENTS
a(n) is divisible by (n+1)*(n+2)/2.
PROG
(PARI) {a(n)=local(F=1+x*O(x^n)); for(m=1, n+2, F=(1+x*F)^m); polcoeff(F, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 15 2005
STATUS
approved