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 A064701 #4 Sep 29 2006 03:00:00 %S A064701 0,1,2,6,20,29,46 %N A064701 Duplicate of A035142. %K A064701 dead %O A064701 1,3