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 A104666 #2 Mar 30 2012 17:26:11 %S A104666 25,1,2,5,3,10,7,4,35,8,11,6,14,16,47,57,9,24,15,18,12,34,232,20,40, %T A104666 46,21,19,129,69,36,13,17,298,31,48,189,76,26,23,53,22,30,198,58,43 %N A104666 Position of n in A105836. %Y A104666 Cf. A105836. %K A104666 nonn %O A104666 1,1 %A A104666 _Zak Seidov_, Apr 22 2005