Sequence A115805 in binary.

Terms

a(0) =0a(1) =11a(2) =110a(3) =1100a(4) =11000a(5) =110000a(6) =1100000a(7) =11000000a(8) =11000011a(9) =110000000a(10) =110000011a(11) =110000110a(12) =1100000000a(13) =1100000011a(14) =1100000110a(15) =1100001100a(16) =11000000000a(17) =11000000011a(18) =11000000110a(19) =11000001100a(20) =11000011000