Numbers whose base-3 representation has the same number of 0's and 1's.

Terms

a(0) =2a(1) =3a(2) =8a(3) =11a(4) =15a(5) =19a(6) =21a(7) =26a(8) =28a(9) =30a(10) =35a(11) =36a(12) =47a(13) =51a(14) =59a(15) =61a(16) =65a(17) =69a(18) =73a(19) =75a(20) =80a(21) =86a(22) =88a(23) =92a(24) =96a(25) =100a(26) =102a(27) =107a(28) =110a(29) =114