Numbers whose base-4 representation has the same number of 2's and 3's.

Terms

a(0) =0a(1) =1a(2) =4a(3) =5a(4) =11a(5) =14a(6) =16a(7) =17a(8) =20a(9) =21a(10) =27a(11) =30a(12) =35a(13) =39a(14) =44a(15) =45a(16) =50a(17) =54a(18) =56a(19) =57a(20) =64a(21) =65a(22) =68a(23) =69a(24) =75a(25) =78a(26) =80a(27) =81a(28) =84a(29) =85