Binary expansion of A074988.

Terms

a(0) =1a(1) =11a(2) =111a(3) =1110a(4) =11101a(5) =111011a(6) =1110111a(7) =11101110a(8) =111011100a(9) =1110111001a(10) =11101110011a(11) =111011100110