Binary numbers that begin and end with 1 and do not contain two adjacent zeros.

Terms

a(0) =1a(1) =11a(2) =101a(3) =111a(4) =1011a(5) =1101a(6) =1111a(7) =10101a(8) =10111a(9) =11011a(10) =11101a(11) =11111a(12) =101011a(13) =101101a(14) =101111a(15) =110101a(16) =110111a(17) =111011a(18) =111101a(19) =111111a(20) =1010101a(21) =1010111a(22) =1011011a(23) =1011101a(24) =1011111a(25) =1101011a(26) =1101101a(27) =1101111a(28) =1110101a(29) =1110111