Squarefree kernel of numbers containing in their decimal representation only the digits 0 and 1.

Terms

a(0) =1a(1) =10a(2) =11a(3) =10a(4) =101a(5) =110a(6) =111a(7) =10a(8) =1001a(9) =1010a(10) =1011a(11) =110a(12) =1101a(13) =1110a(14) =1111a(15) =10a(16) =10001a(17) =10010a(18) =10011a(19) =1010a(20) =10101a(21) =10110a(22) =10111a(23) =110a(24) =11001a(25) =11010a(26) =1001a(27) =1110a(28) =11101a(29) =11110