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 A166271 #3 Mar 31 2012 13:21:20 %S A166271 2,2,2,4,4,6,2,4,6,4,8,6,6,6,8,6,4,4,12,0,6,10,6,10,8,10,6,8,10,8,10, %T A166271 8,10,14,12,14,6,6,0,8,16,8,8,10,4,12,10,12,14,16,12,8,12,18,12,16,12, %U A166271 8,8,8,22,14,8,22,8,18,12,14,16,4,22,10,10,16,16,20,12,10,20,12,16,12 %N A166271 Bisection 2n+1 of A165460. %C A166271 Conjecture: a(n) = -2 * A166269(n). %H A166271 A. Karttunen, <a href="/A166271/b166271.txt">Table of n, a(n) for n = 0..16383</a> %Y A166271 a(n) = A165460(A005408(n)). %K A166271 nonn %O A166271 0,1 %A A166271 _Antti Karttunen_, Oct 13 2009