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 A276790 #11 Jun 07 2018 16:27:01 %S A276790 0,1,2,1,0,1,2,1,1,2,1,0,1,2,1,2,1,0,1,2,1,1,2,1,0,1,2,1,0,1,2,1,1,2, %T A276790 1,0,1,2,1,2,1,0,1,2,1,1,2,1,0,1,2,1,1,2,1,0,1,2,1,2,1,0,1,2,1,1,2,1, %U A276790 0,1,2,1,0,1,2,1,1,2,1,0,1,2,1,2,1,0,1,2,1,1,2,1,0,1,2,1,2,1,0,1 %N A276790 Trajectory of 0 under repeated applications of the map psi: 0 -> 0121, 1 -> 0121121, 2 -> 012121. %C A276790 This is A275925 rewritten in a more canonical form using the alphabet 0,1,2. %Y A276790 Cf. A275925, A276788. %K A276790 nonn %O A276790 0,3 %A A276790 _N. J. A. Sloane_, Oct 14 2016