a(n) = (15*n)!*(6*n)!*n!/((12*n)!*(5*n)!*(3*n)!*(2*n)!).

A295466

a(n) = (15*n)!*(6*n)!*n!/((12*n)!*(5*n)!*(3*n)!*(2*n)!).

Terms

    a(0) =1a(1) =1365a(2) =6531525a(3) =36155455908

External references