OFFSET
0,2
FORMULA
a(n) is the coefficient of q^(2*n+6) in the q-binomial coefficient [2*n+5, n+2].
PROG
(PARI) a(n)=polcoeff(prod(j=n+3, 2*n+5, 1-q^j)/prod(j=1, n+3, 1-q^j), 2*n+6, q)
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 10 2007
STATUS
approved