a(n) = 11*9^n-1.

Terms

a(0) =10a(1) =98a(2) =890a(3) =8018a(4) =72170a(5) =649538a(6) =5845850a(7) =52612658a(8) =473513930a(9) =4261625378a(10) =38354628410a(11) =345191655698