Numbers whose base-9 representation has the same nonzero number of 1's and 2's.

Terms

a(0) =11a(1) =19a(2) =83a(3) =99a(4) =102a(5) =103a(6) =104a(7) =105a(8) =106a(9) =107a(10) =110a(11) =119a(12) =128a(13) =137a(14) =146a(15) =155a(16) =163a(17) =171a(18) =174a(19) =175a(20) =176a(21) =177a(22) =178a(23) =179a(24) =190a(25) =199a(26) =208a(27) =217a(28) =226a(29) =235