a(n) = 9*8^n+1.

Terms

a(0) =10a(1) =73a(2) =577a(3) =4609a(4) =36865a(5) =294913a(6) =2359297a(7) =18874369a(8) =150994945a(9) =1207959553a(10) =9663676417a(11) =77309411329a(12) =618475290625