a(n) = (1/n!) * (5*n)!/(5*n/2)! * (3*n/2)!/(3*n)!.

A262732

a(n) = (1/n!) * (5*n)!/(5*n/2)! * (3*n/2)!/(3*n)!.

Terms

    a(0) =1a(1) =8a(2) =126a(3) =2240a(4) =41990a(5) =811008a(6) =15967980a(7) =318636032a(8) =6421422150a(9) =130395668480

External references