a(n) = 11^n - n.

Terms

a(0) =1a(1) =10a(2) =119a(3) =1328a(4) =14637a(5) =161046a(6) =1771555a(7) =19487164a(8) =214358873a(9) =2357947682a(10) =25937424591a(11) =285311670600