a(n) = (30*n)!*(9*n)!*(5*n)!/((18*n)!*(15*n)!*(10*n)!*n!).

A295454

a(n) = (30*n)!*(9*n)!*(5*n)!/((18*n)!*(15*n)!*(10*n)!*n!).

Terms

    a(0) =1a(1) =380190a(2) =402651263238

External references