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 A031243 #6 Mar 30 2012 18:56:21 %S A031243 1,3,1,1,1,1,1,1,2,1,1,1,1,5,2,2,2,2,1,1,1,1,2,1,1,1,1,2,1,1,1,1,1,1, %T A031243 2,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,3,1,1, %U A031243 1,1,1,1,1,2,1,1,1,1,2,1,1,1,1,2,1,1,1,1,3,2 %N A031243 Length of n-th run of digit 1 in A031235. %K A031243 nonn,base %O A031243 1,2 %A A031243 _Clark Kimberling_