n-th partial product of A093839.

Terms

a(0) =2a(1) =8a(2) =24a(3) =264a(4) =1320a(5) =22440a(6) =157080a(7) =2356200a(8) =18849600a(9) =339292800a(10) =3053635200a(11) =174057206400