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 A030616 #10 Apr 05 2020 02:11:28 %S A030616 1,1,1,1,2,2,1,1,1,2,1,1,1,2,2,2,2,2,1,1,1,2,1,2,1,1,1,1,1,1,1,2,1,1, %T A030616 1,1,1,1,1,1,2,2,4,1,1,1,1,1,1,1,2,1,2,1,1,1,1,1,1,2,1,1,3,1,1,1,1,1, %U A030616 1,1,2,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,2,1,1,1 %N A030616 Length of n-th run of digit 4 in A030604. %K A030616 nonn,base %O A030616 1,5 %A A030616 _Clark Kimberling_ %E A030616 Title corrected by _Sean A. Irvine_, Apr 04 2020