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 A046917 #2 Sep 13 2003 03:00:00 %S A046917 1,1,2,4,9,22,59,169,506,1586 %N A046917 Erroneous version of A000571. %K A046917 dead %O A046917 1,3