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 A031261 #6 Mar 30 2012 18:56:21 %S A031261 1,1,1,1,1,1,1,1,1,5,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1, %T A031261 1,1,1,3,1,1,1,1,1,2,1,1,1,2,3,3,3,3,2,3,2,2,2,2,3,1,1,1,1,3,1,1,1,1, %U A031261 1,2,1,1,1,1,2,1,1,1,1,1,1,1,2,1,1,1,1,2,1,1 %N A031261 Length of n-th run of digit 1 in A031253. %K A031261 nonn,base %O A031261 1,10 %A A031261 _Clark Kimberling_