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 A030558 #6 Mar 30 2012 18:56:18 %S A030558 1,1,1,1,3,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,2,1,1,2, %T A030558 2,5,2,2,1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,1, %U A030558 1,1,1,2,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1 %N A030558 Length of n-th run of digit 2 in A030548. %K A030558 nonn,base %O A030558 1,5 %A A030558 _Clark Kimberling_