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 A317962 #22 Aug 25 2018 02:40:11
%S A317962 1,1121,1121112121121,1121112121121112111212112121121112121121,
%T A317962 1121112121121112111212112121121112121121112111212112111211121211212112111212112121121112121121112111212112121121112121121
%N A317962 To get a(n), apply the morphism 1 -> 1121, 2-> 2 n times to 1.
%C A317962 These are stages in the growth of the Chacon sequence over the alphabet {1,2}. See A049320 for further information and references.
%H A317962 Seiichi Manyama, <a href="/A317962/b317962.txt">Table of n, a(n) for n = 1..6</a>
%e A317962 Over the more usual alphabet {0,1} these strings would be:
%e A317962 0
%e A317962 0010
%e A317962 0010001010010
%e A317962 0010001010010001000101001010010001010010
%e A317962 0010001010010001000101001010010001010010001000101001000100010100101001000101001010010001010010001000101001010010001010010
%e A317962 ...
%Y A317962 Cf. A003462, A049320, A133162.
%K A317962 nonn
%O A317962 1,2
%A A317962 _N. J. A. Sloane_, Aug 24 2018
%E A317962 Offset 1 by _Seiichi Manyama_, Aug 24 2018