a(n)=3!*n!/(8!*19!).

A157983

a(n)=3!*n!/(8!*19!).

Terms

    a(0) =759a(1) =18975a(2) =493350a(3) =13320450a(4) =372972600a(5) =10816205400a(6) =324486162000

External references