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 A074227 #5 Nov 10 2007 03:00:00 %S A074227 1,3,4,5,7,8,9,11,12,13,15,16,17,19,20,21,23,24,25,27,28,29,31,32,33 %N A074227 Duplicate of A042965. %K A074227 dead %O A074227 1,2