a(n) = Product_{i=0..n-1} (7*i+2).

A084947

a(n) = Product_{i=0..n-1} (7*i+2).

Terms

    a(0) =1a(1) =2a(2) =18a(3) =288a(4) =6624a(5) =198720a(6) =7352640a(7) =323516160a(8) =16499324160a(9) =956960801280

External references