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 A083505 #2 Feb 20 2005 03:00:00 %S A083505 1,3,6,10,14 %N A083505 Erroneous version of A027428. %K A083505 dead %O A083505 2,2