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 A087992 #3 May 11 2007 03:00:00 %S A087992 1,2,3,4,5,6,7,8,9,11,22,33,44,55,66,77,88,99,101,121,131,151,181,191 %N A087992 Duplicate of A062687. %K A087992 dead %O A087992 1,2