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 A088401 #3 May 11 2007 03:00:00 %S A088401 5,1,6,2,7,3,8,4,9,14,19,24,29,34,39,44,49,99,149,199,249,299,349,399 %N A088401 Duplicate of A077491. %K A088401 dead %O A088401 1,1