Numbers with only digits "1" and two digits "0".

Terms

a(0) =100a(1) =1001a(2) =1010a(3) =1100a(4) =10011a(5) =10101a(6) =10110a(7) =11001a(8) =11010a(9) =11100a(10) =100111a(11) =101011a(12) =101101a(13) =101110a(14) =110011a(15) =110101a(16) =110110a(17) =111001a(18) =111010a(19) =111100a(20) =1001111a(21) =1010111a(22) =1011011a(23) =1011101a(24) =1011110a(25) =1100111a(26) =1101011a(27) =1101101a(28) =1101110a(29) =1110011