OFFSET
0,2
COMMENTS
FORMULA
a(n) = A108990(n+2, n)*2/(n+2) for n>=0.
PROG
(PARI) {a(n)=local(F=1); for(m=1, n+2, F=(1+x*F+x*O(x^n))^m); polcoeff(F, n)*2/(n+2)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 15 2005
STATUS
approved