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 A030395 #9 Mar 31 2020 18:53:40 %S A030395 1,1,1,1,1,3,1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,2,1,1,1,2,1,1,1,2,1,2,2, %T A030395 5,1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1, %U A030395 1,1,1,2,2,2,3,1,1,1,1,1,1,2,1,1,1,1,1 %N A030395 Length of n-th run of digit 3 in A030386. %K A030395 nonn,base %O A030395 1,6 %A A030395 _Clark Kimberling_ %E A030395 a(89) corrected by _Sean A. Irvine_, Mar 31 2020