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 A014558 #1 Dec 11 1999 03:00:00 %S A014558 1,1,2,7,22,82,333,1448,6572,30490,143552,683101 %N A014558 Erroneous version of A000228. %K A014558 dead %O A014558 0,3