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 A039688 #2 May 16 2003 03:00:00 %S A039688 120,672,523776,459818240,1476304896,31001180160 %N A039688 Erroneous version of A005820. %D A039688 David Wells, "The Penguin Book of Curious and Interesting Numbers," Penguin Books, London, 1986, pages 135, 159 and 185. %K A039688 dead %O A039688 1,1