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

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =8a(5) =12a(6) =16a(7) =17a(8) =18a(9) =19a(10) =32a(11) =33a(12) =34a(13) =35a(14) =48a(15) =49a(16) =50a(17) =51a(18) =64a(19) =68a(20) =72a(21) =76a(22) =128a(23) =132a(24) =136a(25) =140a(26) =192a(27) =196a(28) =200a(29) =204