a(n) = C(4+2*n,4+n)*C(9+2*n,0+n).

A114252

a(n) = C(4+2*n,4+n)*C(9+2*n,0+n).

Terms

    a(0) =1a(1) =66a(2) =2184a(3) =54600a(4) =1178100a(5) =23279256a(6) =434546112a(7) =7801876368a(8) =136246002750

External references