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 A039748 #1 Dec 11 1999 03:00:00 %S A039748 1,1,2,12,184 %N A039748 Erroneous version of A051421. %K A039748 dead %O A039748 0,3