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 A084387 #4 May 11 2007 03:00:00 %S A084387 1,3,8,9,12,15,17,18,19,22,24,28,30,35,36,37,38,40,41,44,48,54,55,56, %T A084387 57 %N A084387 Duplicate of A080761. %K A084387 dead %O A084387 1,2