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 A026518 #7 Oct 05 2019 19:58:32 %S A026518 5,1,1,1,2,2,2,1,5,1,1,2,4,2,1,1,5,1,2,2,2,1,1,1,6,1,2,4,2,1,6,1,1,1, %T A026518 2,2,1,1,1,5,1,1,2,2,2,2,1,1,5,1,1,1,2,2,1,1,1,6,1,2,4,2,1,1,5,1,1,1, %U A026518 2,2,2,1,5,1,1,2,2,2,2,1,1,5,1,2,2,2,1,1,1,5 %N A026518 a(n) = length of n-th run of identical symbols in A026517. %K A026518 nonn %O A026518 1,1 %A A026518 _Clark Kimberling_ %E A026518 a(53) onward corrected by _Sean A. Irvine_, Oct 05 2019