a(n) = 7*n! + 1.

Terms

a(0) =8a(1) =8a(2) =15a(3) =43a(4) =169a(5) =841a(6) =5041a(7) =35281a(8) =282241a(9) =2540161a(10) =25401601a(11) =279417601a(12) =3353011201a(13) =43589145601a(14) =610248038401