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 A089388 #3 Jan 24 2006 03:00:00 %S A089388 2,3,4,6,7,9,13,15,16,18,21,22,25,28,34,39,42,51,55,58,60,63,67,70,72 %N A089388 Duplicate of A055494. %K A089388 dead %O A089388 1,1