This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A255745 #12 Mar 19 2015 10:50:05
%S A255745 1,11,11,110,11,110,110,1100,11,110,110,1100,110,1100,1100,11000,11,
%T A255745 110,110,1100,110,1100,1100,11000,110,1100,1100,11000,1100,11000,
%U A255745 11000,110000,11,110,110,1100,110,1100,1100,11000,110,1100,1100,11000,1100,11000,11000
%N A255745 a(1) = 1; for n > 1, a(n) = 11*10^{A000120(n-1)-1}.
%C A255745 Also, this is a row of the square array A255740.
%C A255745 Partial sums give A255766.
%C A255745 Is this also A151787 written in base 2?
%e A255745 Also, written as an irregular triangle in which the row lengths are the terms of A011782, the sequence begins:
%e A255745 1;
%e A255745 11;
%e A255745 11, 110;
%e A255745 11, 110, 110, 1100;
%e A255745 11, 110, 110, 1100, 110, 1100, 1100, 11000;
%e A255745 ...
%o A255745 (PARI) a(n) = if (n==1, 1, 11*10^(hammingweight(n-1)-1)); \\ _Michel Marcus_, Mar 13 2015
%Y A255745 Cf. A000120, A151787, A147582, A151789, A151779, A151791, A151782, A255740, A255741, A255743, A255744, A255766.
%K A255745 nonn
%O A255745 1,2
%A A255745 _Omar E. Pol_, Mar 05 2015
%E A255745 More terms from _Michel Marcus_, Mar 13 2015