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 A084994 #2 Feb 24 2006 03:00:00 %S A084994 4,6,9,22,33,55,77,111,121,141,161,202,262,303,323,393,454,505,515,535 %N A084994 Duplicate of A046328. %K A084994 dead %O A084994 1,1