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 A084560 #3 Sep 29 2006 03:00:00 %S A084560 2,139,1627,18839,123229,776257,3873011,23884639,36539311,196943081 %N A084560 Duplicate of A054681. %K A084560 dead %O A084560 1,1