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 A080499 #4 May 11 2007 03:00:00 %S A080499 1,1,2,6,4,60,6,168,48,360,10,47520,12,1092,1680,20160,16,440640,18 %N A080499 Duplicate of A072513. %K A080499 dead %O A080499 1,3