a(n) = (18*n)!*(5*n)!*(3*n)!/((10*n)!*(9*n)!*(6*n)!*n!).

A295442

a(n) = (18*n)!*(5*n)!*(3*n)!/((10*n)!*(9*n)!*(6*n)!*n!).

Terms

    a(0) =1a(1) =4862a(2) =65132550a(3) =987291797996

External references