Second column of triangle A067304.

Terms

a(0) =1a(1) =5a(2) =36a(3) =328a(4) =3440a(5) =39408a(6) =478912a(7) =6068480a(8) =79315200a(9) =1061628160a(10) =14480086016a(11) =200540018688