n! concatenated with n divided by n.

Terms

a(0) =11a(1) =11a(2) =21a(3) =61a(4) =241a(5) =1201a(6) =7201a(7) =50401a(8) =403201a(9) =36288001a(10) =362880001a(11) =3991680001a(12) =47900160001a(13) =622702080001