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 A104662 #2 Mar 30 2012 17:26:11 %S A104662 2,11,3,5,9,4,7,21,6,8,56,13,12,46,10,14,32,16,17,15,18,19,23,20,22, %T A104662 37,25,24,39,26,27,67,31,28,47,30,29,51,33,41,36,40,48,55,45,44,54,34, %U A104662 49,58,42,60,38,43,71,35,53 %N A104662 Position of 2n in A105692. %C A104662 Is A105692 a permutation of even integers? %Y A104662 Cf. A105692. %K A104662 nonn %O A104662 1,1 %A A104662 _Zak Seidov_, Apr 22 2005