a(n) = (14*n)!*(6*n)!*(4*n)!/((12*n)!*(7*n)!*(3*n)!*(2*n)!).

A295450

a(n) = (14*n)!*(6*n)!*(4*n)!/((12*n)!*(7*n)!*(3*n)!*(2*n)!).

Terms

    a(0) =1a(1) =52a(2) =6300a(3) =867724a(4) =126266140a(5) =18946089552

External references