Triangle of binary numbers with some initial repeats.

Terms

a(0) =11a(1) =110a(2) =111a(3) =1010a(4) =1100a(5) =1101a(6) =1110a(7) =1111a(8) =10100a(9) =10101a(10) =11000a(11) =11001a(12) =11010a(13) =11011a(14) =11100a(15) =11101a(16) =11110a(17) =11111a(18) =100100a(19) =101000a(20) =101001a(21) =101010a(22) =101011a(23) =101101a(24) =110000a(25) =110001a(26) =110010a(27) =110011a(28) =110100a(29) =110101