1st column of A145142.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =144a(5) =1200a(6) =9960a(7) =89040a(8) =1231776a(9) =18325440a(10) =280100160a(11) =4415368320a(12) =78497147520