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 A169760 #2 Mar 30 2012 16:51:44 %S A169760 1,4,16,62,246,980,3912,15632,62494,249904 %N A169760 A169759(n)/6. %K A169760 nonn %O A169760 2,2 %A A169760 _N. J. A. Sloane_, May 06 2010