Binary Keith numbers.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =8a(5) =16a(6) =32a(7) =64a(8) =128a(9) =143a(10) =256a(11) =285a(12) =512a(13) =569a(14) =683a(15) =1024a(16) =1138a(17) =1366a(18) =2048a(19) =2276a(20) =4096a(21) =8192a(22) =16384a(23) =32768a(24) =65536a(25) =131072a(26) =154203a(27) =262144a(28) =308405a(29) =524288