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 A030381 #6 Mar 30 2012 18:56:18 %S A030381 1,1,1,1,3,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,2,2,2,5,1,1,1,2,1,1,1,1,2,1, %T A030381 1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,2,2,3,2,1,1,1,1,1, %U A030381 1,1,1,1,2,1,1,1,1,1,2,1,1,1,2,1,1,1,1,1,3,1 %N A030381 Length of n-th run of digit 2 in A030373. %K A030381 nonn,base %O A030381 1,5 %A A030381 _Clark Kimberling_