a(n) = 8*11^n+1.

Terms

a(0) =9a(1) =89a(2) =969a(3) =10649a(4) =117129a(5) =1288409a(6) =14172489a(7) =155897369a(8) =1714871049a(9) =18863581529a(10) =207499396809