Numbers of the form (9^i)*(11^j), with i, j >= 0.

Terms

a(0) =1a(1) =9a(2) =11a(3) =81a(4) =99a(5) =121a(6) =729a(7) =891a(8) =1089a(9) =1331a(10) =6561a(11) =8019a(12) =9801a(13) =11979a(14) =14641a(15) =59049a(16) =72171a(17) =88209a(18) =107811a(19) =131769a(20) =161051a(21) =531441a(22) =649539a(23) =793881a(24) =970299a(25) =1185921a(26) =1449459a(27) =1771561a(28) =4782969a(29) =5845851