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 A209639 #8 Mar 30 2012 17:23:15 %S A209639 1,3,2,7,2,5,6,15,2,5,4,11,6,13,14,31,2,5,4,11,4,9,10,23,6,13,12,27, %T A209639 14,29,30,63,2,5,4,11,4,9,10,23,4,9,8,19,10,21,22,47,6,13,12,27,12,25, %U A209639 26,55,14,29,28,59,30,61,62,127,2,5,4,11,4,9,10,23,4,9,8,19,10,21,22,47,4,9,8,19,8,17,18,39,10,21,20,43,22,45,46,95,6,13,12 %N A209639 Bisection of A209859. %H A209639 Antti Karttunen, <a href="/A209639/b209639.txt">Table of n, a(n) for n = 0..65535</a> %F A209639 a(n) = A209859(A005408(n)). %K A209639 nonn,base %O A209639 0,2 %A A209639 _Antti Karttunen_, Mar 24 2012