a(n) = (5*n)!*(4*n)! / ((3*n)!^2 * (2*n)! * n!).
A364507
a(n) = (5*n)!*(4*n)! / ((3*n)!^2 * (2*n)! * n!).
Terms
- a(0) =1a(1) =40a(2) =5880a(3) =1101100a(4) =229265400a(5) =50678855040
External references
- oeis: A364507
A364507
a(n) = (5*n)!*(4*n)! / ((3*n)!^2 * (2*n)! * n!).