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 A067537 #3 May 11 2007 03:00:00 %S A067537 8,12,18,20,27,28,30,32,42,44,45,48,50,52,63,66,68,70,72,75,76,78,80 %N A067537 Duplicate of A046339. %K A067537 dead %O A067537 0,1