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 A071871 #6 Sep 12 2010 03:00:00 %S A071871 1,2,71,9596,1355849266,1032458258547,1653031004194447737 %N A071871 Duplicate of A055030. %K A071871 dead %O A071871 1,2