Numbers whose base-4 representation Sum_{i=0..m} d(i)*4^(m-i) has even d(i) for all odd i.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =10a(7) =12a(8) =14a(9) =16a(10) =17a(11) =18a(12) =19a(13) =24a(14) =25a(15) =26a(16) =27a(17) =32a(18) =33a(19) =34a(20) =35a(21) =40a(22) =41a(23) =42a(24) =43a(25) =48a(26) =49a(27) =50a(28) =51a(29) =56