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 A064120 #5 Mar 30 2012 16:49:12 %S A064120 1,6,180,873600,772107033600 %N A064120 A036981(n)/n!^2. %H A064120 <a href="/index/To#tournament">Index entries for sequences related to tournaments</a> %K A064120 nonn,hard %O A064120 0,2 %A A064120 _N. J. A. Sloane_, Dec 01 2001