a(n) = C(2+2*n, n) * C(7+2*n, 2+n).
A113895
a(n) = C(2+2*n, n) * C(7+2*n, 2+n).
Terms
- a(0) =21a(1) =336a(2) =4950a(3) =72072a(4) =1051050a(5) =15402816a(6) =226972746a(7) =3362559200a(8) =50062040028a(9) =748664904000
External references
- oeis: A113895