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 A078645 #4 Nov 10 2007 03:00:00 %S A078645 1,2,3,5,9,11,13,17,19,23,25,29,33,35,37,39,41,43,49,53,57,65,67,69,71 %N A078645 Duplicate of A067139. %K A078645 dead %O A078645 1,2