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 A039707 #1 Dec 11 1999 03:00:00 %S A039707 1,2,4,11,33,142,822,6910 %N A039707 Erroneous version of A005470. %K A039707 dead %O A039707 1,2