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 A083027 #4 May 11 2007 03:00:00 %S A083027 0,2,3,5,7,8,10,12,14,15,17,19,20,22,24,26,27,29,31,32,34,36,38,39,41 %N A083027 Duplicate of A060107. %K A083027 dead %O A083027 0,2