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 A084731 #3 May 11 2007 03:00:00 %S A084731 2,2,2,2,5,2,2,2,10,6,2,61,14,15,5,24,19,2,46,3,11,22,41,2,12,22,3,2 %N A084731 Duplicate of A066180. %K A084731 dead %O A084731 1,1