a(n) = C(3+2*n,3+n)*C(8+2*n,0+n).

A114251

a(n) = C(3+2*n,3+n)*C(8+2*n,0+n).

Terms

    a(0) =1a(1) =50a(2) =1386a(3) =30576a(4) =600600a(5) =11027016a(6) =193993800a(7) =3316739712a(8) =55588369122a(9) =918398981500

External references