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 A052397 #5 May 11 2007 03:00:00 %S A052397 1,2,6,24,119,694,4582,33324,261808,2190688,19318688,178108704 %N A052397 Duplicate of A047889. %K A052397 dead %O A052397 0,2