a(n) = Product_{k=0..n-1} (n+3*k+2).

A384257

a(n) = Product_{k=0..n-1} (n+3*k+2).

Terms

    a(0) =1a(1) =3a(2) =28a(3) =440a(4) =9720a(5) =276640a(6) =9634240a(7) =396809280a(8) =18866848000

External references