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 A083042 #3 May 11 2007 03:00:00 %S A083042 0,1,3,5,6,8,10,12,13,15,17,18,20,22,24,25,27,29,30,32,34,36,37,39 %N A083042 Duplicate of A082977. %K A083042 dead %O A083042 0,3