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 A056168 #2 Feb 27 2009 03:00:00 %S A056168 1,2,3,4,6,8,10,12,15,17,20,23,25,28,32,35,38,41,45,49,52,56,60,64,68 %N A056168 Duplicate of A054041. %K A056168 dead %O A056168 0,2