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 A088402 #3 Nov 10 2007 03:00:00 %S A088402 2,4,6,8,1,3,5,7,9,11,13,15,17,19,39,59,79,99,119,139,159,179,199,399 %N A088402 Duplicate of A077492. %K A088402 dead %O A088402 1,1