Squares written in base 2.

Terms

a(0) =0a(1) =1a(2) =100a(3) =1001a(4) =10000a(5) =11001a(6) =100100a(7) =110001a(8) =1000000a(9) =1010001a(10) =1100100a(11) =1111001a(12) =10010000a(13) =10101001a(14) =11000100a(15) =11100001a(16) =100000000a(17) =100100001a(18) =101000100a(19) =101101001a(20) =110010000a(21) =110111001a(22) =111100100a(23) =1000010001a(24) =1001000000a(25) =1001110001a(26) =1010100100a(27) =1011011001