Numbers whose base-11 representation has the same number of 1's and 2's.

Terms

a(0) =0a(1) =3a(2) =4a(3) =5a(4) =6a(5) =7a(6) =8a(7) =9a(8) =10a(9) =13a(10) =23a(11) =33a(12) =36a(13) =37a(14) =38a(15) =39a(16) =40a(17) =41a(18) =42a(19) =43a(20) =44a(21) =47a(22) =48a(23) =49a(24) =50a(25) =51a(26) =52a(27) =53a(28) =54a(29) =55