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 A094356 #2 Sep 29 2006 03:00:00 %S A094356 4,16,121,841,1681,5041 %N A094356 Duplicate of A087335. %K A094356 dead %O A094356 1,1