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 A075711 #4 May 11 2007 03:00:00 %S A075711 1,1,2,3,12,10,20,35,280,252,2520,2310,27720,25740,24024,45045,720720 %N A075711 Duplicate of A027611. %K A075711 dead %O A075711 1,3