a(n) = binomial(2+2*n, 2+n) * binomial(7+2*n, n).

A114238

a(n) = binomial(2+2*n, 2+n) * binomial(7+2*n, n).

Terms

    a(0) =1a(1) =36a(2) =825a(3) =16016a(4) =286650a(5) =4900896a(6) =81477396a(7) =1330243200a(8) =21455160012a(9) =343138081000

External references