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 A049710 #15 Nov 11 2014 03:35:46 %S A049710 2,1,2,2,1,2,1,1,2,1,1,2,2,1,2,2,1,1,2,1,2,2,1,2,1,1,2,2,1,2,2,1,2,1, %T A049710 1,2,1,1,2,2,1,2,1,1,2,1,2,2,1,2,2,1,1,2,1,1,2,2,1,2,1,1,2,1,1,2,2,1, %U A049710 2,2,1,2,1,1,2,1,2,2,1,1,2,1,1,2,2,1,2,1,1,2,1,1,2,2,1,2,2,1,1,2,1,2,2,1,2 %N A049710 a(n)=3-k(n), where k=A006928; also, a and k have the same runlength sequence, with n-th term k(n-1) for n >= 2. %C A049710 Essentially the same as A049705. [From _R. J. Mathar_, Oct 15 2008] %F A049710 a(n) = A049705(n+1) = A088569(n) for n > 1. - _Jean-Christophe Hervé_, Nov 10 2014 %Y A049710 Cf. A000002 (Kolakoski sequence). %K A049710 nonn %O A049710 1,1 %A A049710 _Clark Kimberling_