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 A072837 #3 May 11 2007 03:00:00 %S A072837 1,0,0,0,0,12,0,0,30,20,0,0,30,0,0,0,0,120,0,0,132,60,0,0,90,0,0,0,0, %T A072837 180 %N A072837 Duplicate of A023917. %K A072837 dead %O A072837 0,6