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 A026499 #9 Oct 03 2019 21:12:58 %S A026499 3,1,7,1,1,3,3,1,8,1,6,1,7,1,1,3,3,1,1,7,1,3,3,1,7,1,1,3,3,1,8,1,6,1, %T A026499 8,1,3,3,1,1,7,1,6,1,7,1,1,3,3,1,8,1,6,1,7,1,1,3,3,1,1,7,1,3,3,1,7,1, %U A026499 1,3,3,1,1,7,1,6,1,8,1,3,3,1,1,7,1,3,3,1,7,1,1,3,3,1,8 %N A026499 a(n) = length of n-th run of identical symbols in A026498. %H A026499 Michael De Vlieger, <a href="/A026499/b026499.txt">Table of n, a(n) for n = 1..10000</a> %t A026499 Length /@ Split@ Array[1 + Mod[DigitCount[3 # + 1, 2, 1], 2] &, 300, 0] (* _Michael De Vlieger_, Oct 03 2019 *) %K A026499 nonn %O A026499 1,1 %A A026499 _Clark Kimberling_ %E A026499 Corrected and extended by _Sean A. Irvine_, Oct 03 2019