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 A074183 #4 Jan 09 2009 03:00:00 %S A074183 1,1,1,2,2,3,4,5,5,6,7,8,8,9,10,11,11,12,13,14,14,15,16,17,18,18,19,20 %N A074183 Duplicate of A039960. %K A074183 dead %O A074183 1,4