Sequence A115847 in binary.

Terms

a(0) =0a(1) =1a(2) =10a(3) =11a(4) =100a(5) =101a(6) =110a(7) =111a(8) =1000a(9) =1001a(10) =1010a(11) =1011a(12) =1100a(13) =1101a(14) =1110a(15) =1111a(16) =10000a(17) =10010a(18) =10100a(19) =10110a(20) =11000a(21) =11010a(22) =11100a(23) =11110a(24) =100000a(25) =100001a(26) =100100a(27) =100101a(28) =101000a(29) =101001