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

Terms

a(0) =8a(1) =98a(2) =1088a(3) =11978a(4) =131768a(5) =1449458a(6) =15944048a(7) =175384538a(8) =1929229928a(9) =21221529218a(10) =233436821408