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 A047810 #5 May 11 2007 03:00:00 %S A047810 0,4,20,56,120,220,364,560,816,1140,1540,2024,2600,3276,4060,4960,5984 %N A047810 Duplicate of A002492. %K A047810 dead %O A047810 0,2