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 A089023 #3 May 11 2007 03:00:00 %S A089023 1,4,28,232,2092,19864,195352,1970896,20275660,211823800,2240795848 %N A089023 Duplicate of A035610. %K A089023 dead %O A089023 0,2