a(n) = n*9^n - 1.

Terms

a(0) =8a(1) =161a(2) =2186a(3) =26243a(4) =295244a(5) =3188645a(6) =33480782a(7) =344373767a(8) =3486784400a(9) =34867844009a(10) =345191655698