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 A030561 #10 Apr 03 2020 20:29:39 %S A030561 1,1,1,1,2,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,2,1,1, %T A030561 1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,3,1,1,1,1,1,2,1,1,1,1,1,2,1,1, %U A030561 1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,3,2,2,2,2 %N A030561 Length of n-th run of digit 5 in A030548. %K A030561 nonn,base %O A030561 1,5 %A A030561 _Clark Kimberling_ %E A030561 a(88) corrected by _Sean A. Irvine_, Apr 03 2020