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 A088403 #3 May 11 2007 03:00:00 %S A088403 125,25,15,5,4,3,2,1,9,8,7,6,23,22,12,11,37,36,62,61,87,86,112,111,236 %N A088403 Duplicate of A077495. %K A088403 dead %O A088403 1,1