Binary expansions of odd numbers with two zeros in their binary expansion.

Terms

a(0) =1001a(1) =10011a(2) =10101a(3) =11001a(4) =100111a(5) =101011a(6) =101101a(7) =110011a(8) =110101a(9) =111001a(10) =1001111a(11) =1010111a(12) =1011011a(13) =1011101a(14) =1100111a(15) =1101011a(16) =1101101a(17) =1110011a(18) =1110101a(19) =1111001a(20) =10011111a(21) =10101111a(22) =10110111a(23) =10111011a(24) =10111101a(25) =11001111a(26) =11010111a(27) =11011011a(28) =11011101a(29) =11100111