OFFSET
0,3
MATHEMATICA
Table[Sum[Binomial[k^2, k]Binomial[k^2, n-k], {k, 0, n}], {n, 0, 20}] (* Harvey P. Dale, Dec 05 2012 *)
PROG
(PARI) a(n)=sum(k=0, n, binomial(k^2, k)*binomial(k^2, n-k))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jan 31 2008
STATUS
approved