a(n) = 10*a(n-1) + 11*a(n-2).

Terms

a(0) =0a(1) =1a(2) =10a(3) =111a(4) =1220a(5) =13421a(6) =147630a(7) =1623931a(8) =17863240a(9) =196495641a(10) =2161452050a(11) =23775972551a(12) =261535698060