First differences of 9^n (A001019).

Terms

a(0) =1a(1) =8a(2) =72a(3) =648a(4) =5832a(5) =52488a(6) =472392a(7) =4251528a(8) =38263752a(9) =344373768a(10) =3099363912a(11) =27894275208a(12) =251048476872