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 A083455 #4 May 11 2007 03:00:00 %S A083455 1,2,7,77,141,151,161,242,252,262,777,7777,14041,14141,14241,15051 %N A083455 Duplicate of A083829. %K A083455 dead %O A083455 1,2