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

Terms

a(0) =11a(1) =14a(2) =27a(3) =30a(4) =35a(5) =39a(6) =44a(7) =45a(8) =50a(9) =54a(10) =56a(11) =57a(12) =75a(13) =78a(14) =91a(15) =94a(16) =99a(17) =103a(18) =108a(19) =109a(20) =114a(21) =118a(22) =120a(23) =121a(24) =131a(25) =135a(26) =140a(27) =141a(28) =147a(29) =151