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 A023407 #14 Jan 27 2022 22:46:14 %S A023407 6,3,3,6,6,3,6,3,6,3,3,3,3,3,6,3,3,3,6,3,3,3,3,3,6,6,3,3,6,3,3,6,3,6, %T A023407 3,3,3,6,3,6,3,6,6,3,3,6,3,6,6,6,3,3,3,3,6,6,3,6,3,3,3,6,6,6,3,6,3,3, %U A023407 6,6,6,3,6,6,3,3,6,3,3,3,6,3,3,6,3,6,3,3,6,6,3,3,6,3,3,6,3,3,6,3,6,3,6,3,6,3,3,3 %N A023407 If any power of 2 ends with k 3's and 6's, they must be the first k terms of this sequence in reverse order. %H A023407 Ray Chandler, <a href="/A023407/b023407.txt">Table of n, a(n) for n = 1..10000</a> %H A023407 Milan Janjic, <a href="http://www.pmfbl.org/janjic/">Enumerative Formulas for Some Functions on Finite Sets</a> %F A023407 a(n) = 3*A023396(n). %Y A023407 Cf. A023396. %K A023407 nonn,base %O A023407 1,1 %A A023407 _David W. Wilson_