a(n) = (18*n)!*(3*n)!*(2*n)!/((9*n)!*(7*n)!*(6*n)!*n!).

A295448

a(n) = (18*n)!*(3*n)!*(2*n)!/((9*n)!*(7*n)!*(6*n)!*n!).

Terms

    a(0) =1a(1) =58344a(2) =12021607800

External references