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 A044950 #4 Mar 30 2012 18:56:49 %S A044950 1,1,1,1,1,1,1,1,1,2,0,2,2,2,2,2,2,2,2,2,2,0,2,2,2,2,2,2,2,2,2,2,0,2, %T A044950 2,2,2,2,2,2,2,2,2,0,2,2,2,2,2,2,2,2,2,2,0,2,2,2,2,2,2,2,2,2,2,0,2,2, %U A044950 2,2,2,2,2,2,2,2,0,2,2,2,2,2,2,2,2,2,2,0,2,2 %N A044950 Runs of odd length in the base 10 representation of n. %K A044950 nonn,base %O A044950 1,10 %A A044950 _Clark Kimberling_