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 A023406 #13 Jan 27 2022 22:45:51 %S A023406 6,1,6,1,1,1,6,1,6,1,6,6,1,6,6,6,6,6,6,1,6,1,1,1,6,6,6,6,6,6,6,6,1,6, %T A023406 6,1,6,6,6,6,6,1,1,1,1,6,6,1,6,1,1,6,1,1,6,1,1,6,1,1,1,1,6,1,1,6,1,6, %U A023406 6,6,1,1,6,6,6,1,6,6,6,1,1,1,1,1,6,1,1,6,6,6,1,6,1,6,6,1,6,1,6,6,1,1,1,1,1,6,1,1 %N A023406 If any even power of 2 ends with k 1's and 6's, they must be the first k terms of this sequence in reverse order. %H A023406 Ray Chandler, <a href="/A023406/b023406.txt">Table of n, a(n) for n = 1..10000</a> %K A023406 nonn,base %O A023406 1,1 %A A023406 _David W. Wilson_