a(n) = ((10^n - 1) - 9^n)/9.

Terms

a(0) =2a(1) =30a(2) =382a(3) =4550a(4) =52062a(5) =579670a(6) =6328142a(7) =68064390a(8) =723690622a(9) =7624326710a(10) =79730051502a(11) =828681574630