Odd positive integers in base 2 (bisection of A007088).

Terms

a(0) =1a(1) =11a(2) =101a(3) =111a(4) =1001a(5) =1011a(6) =1101a(7) =1111a(8) =10001a(9) =10011a(10) =10101a(11) =10111a(12) =11001a(13) =11011a(14) =11101a(15) =11111a(16) =100001a(17) =100011a(18) =100101a(19) =100111a(20) =101001a(21) =101011a(22) =101101a(23) =101111a(24) =110001a(25) =110011a(26) =110101a(27) =110111a(28) =111001a(29) =111011