a(n) = (9*n)!*(2*n)!*(3*n/2)!/((9*n/2)!*(4*n)!*(3*n)!*n!).

A364173

a(n) = (9*n)!*(2*n)!*(3*n/2)!/((9*n/2)!*(4*n)!*(3*n)!*n!).

Terms

    a(0) =1a(1) =128a(2) =43758a(3) =17039360a(4) =7012604550

External references