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 A083265 #3 May 11 2007 03:00:00 %S A083265 1,1,2,3,12,20,60,210,840,504,2520,27720,27720,51480,360360,180180 %N A083265 Duplicate of A067391. %K A083265 dead %O A083265 1,3