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 A047054 #6 May 11 2007 03:00:00 %S A047054 1,5,50,750,15000,375000,11250000,393750000,15750000000,708750000000 %N A047054 Duplicate of A052562. %K A047054 dead %O A047054 0,2