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 A084133 #3 May 11 2007 03:00:00 %S A084133 1,3,19,117,721,4443,27379,168717,1039681,6406803,39480499,243289797 %N A084133 Duplicate of A005667. %H A084133 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a> %K A084133 dead %O A084133 0,2