Numbers k with an even number of 1's in binary, ignoring last bit.

Terms

a(0) =0a(1) =1a(2) =6a(3) =7a(4) =10a(5) =11a(6) =12a(7) =13a(8) =18a(9) =19a(10) =20a(11) =21a(12) =24a(13) =25a(14) =30a(15) =31a(16) =34a(17) =35a(18) =36a(19) =37a(20) =40a(21) =41a(22) =46a(23) =47a(24) =48a(25) =49a(26) =54a(27) =55a(28) =58a(29) =59