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 A031262 #6 Mar 30 2012 18:56:21 %S A031262 1,1,1,1,1,1,2,1,1,1,1,1,1,2,2,2,1,1,2,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1, %T A031262 1,1,1,1,1,1,1,1,1,1,1,2,3,2,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,2, %U A031262 1,1,1,1,1,1,2,1,1,1,1,2,1,1,1,1,1,3,1,1,1,1 %N A031262 Length of n-th run of digit 2 in A031253. %K A031262 nonn,base %O A031262 1,7 %A A031262 _Clark Kimberling_