a(1) = 1, a(n) = n*(n-2)! + n - 1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =11a(4) =34a(5) =149a(6) =846a(7) =5767a(8) =45368a(9) =403209a(10) =3991690a(11) =43545611a(12) =518918412a(13) =6706022413a(14) =93405312014