Sequence A165404 shown in binary, or equivalently, sequence A163901 in quaternary base.

Terms

a(0) =0a(1) =1a(2) =100a(3) =110a(4) =111a(5) =10000a(6) =10010a(7) =10011a(8) =11000a(9) =11001a(10) =11100a(11) =11110a(12) =11111a(13) =1000000a(14) =1000010a(15) =1000011a(16) =1001000a(17) =1001001a(18) =1001100a(19) =1001110a(20) =1001111a(21) =1100000a(22) =1100001a(23) =1100100a(24) =1100110a(25) =1100111a(26) =1110000a(27) =1110010a(28) =1110011