Partial products of A073846.

Terms

a(0) =1a(1) =2a(2) =8a(3) =24a(4) =144a(5) =720a(6) =5760a(7) =40320a(8) =362880a(9) =3991680a(10) =39916800a(11) =518918400a(12) =6227020800a(13) =105859353600