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 A031246 #11 Apr 19 2020 17:39:07 %S A031246 1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, %T A031246 2,1,1,1,2,1,1,1,1,2,1,1,1,1,2,1,1,1,1,2,1,2,2,2,5,1,1,1,1,1,1,1,1,2, %U A031246 1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1 %N A031246 Length of n-th run of digit 4 in A031235. %K A031246 nonn,base %O A031246 1,8 %A A031246 _Clark Kimberling_ %E A031246 a(86) corrected by _Sean A. Irvine_, Apr 19 2020