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 A031264 #9 Apr 20 2020 19:01:30 %S A031264 1,2,1,1,1,1,1,2,1,1,1,1,1,1,1,1,3,1,1,1,1,2,1,1,1,1,3,2,1,1,1,1,2,1, %T A031264 1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,3,1,1,1,1,1,1,1, %U A031264 1,2,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1 %N A031264 Length of n-th run of digit 4 in A031253. %K A031264 nonn,base %O A031264 1,2 %A A031264 _Clark Kimberling_ %E A031264 a(79) corrected by _Sean A. Irvine_, Apr 20 2020