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 A087757 #2 Jun 12 2004 03:00:00 %S A087757 1,3,5,6,9,10,11,13,17,18,19,20,22,23,25,28,33,34,35,36,37,39,40,41,43 %N A087757 Erroneous version of A088359. %K A087757 dead %O A087757 1,2