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 A026484 #4 Jan 09 2009 03:00:00 %S A026484 1,2,3,4,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61,65,69,73,77,81,85, %T A026484 89,93,97,101,105 %N A026484 Erroneous version of A026488. %K A026484 dead %O A026484 1,2