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 A119647 #7 Dec 07 2019 01:30:37
%S A119647 1,2,1,3,1,2,1,1,2,1,3,1,2,1,2,1,3,1,2,1,1,2,1,3,1,2,1,3,1,2,1,1,2,1,
%T A119647 3,1,2,1,2,1,3,1,2,1,1,2,1,3,1,2,1,1,2,1,3,1,2,1,2,1,3,1,2,1,1,2,1,3,
%U A119647 1,2,1,3,1,2,1,1,2,1,3,1,2,1,2,1,3,1,2,1,1,2,1,3,1,2,1,2,1,3,1,2,1,1,2,1,3
%N A119647 Fixed point of the morphism 1->{1,2}, 2->{1,3}, 3->{1}.
%t A119647 Nest[Flatten[Join[ #, # /. {1 -> {1, 2}, 2 -> {1, 3}}]] &, {1}, 5] // Flatten
%Y A119647 Cf. A103684.
%K A119647 nonn
%O A119647 1,2
%A A119647 _Robert G. Wilson v_, Jul 27 2006
%E A119647 Name and data corrected by _Michel Dekking_, Dec 02 2019