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 A009168 #8 Jan 27 2014 09:12:45 %S A009168 1,0,12,480,25872,2031360,227781312,34846855680,6932161765632, %T A009168 1724433365360640,521307469175442432,187630895361738301440, %U A009168 79180079598904589094912,38701262478049196612321280 %N A009168 Expansion of cosh(tan(x)^2). %t A009168 Cosh[ Tan[ x ]^2 ] (* Even Part *) %K A009168 nonn %O A009168 0,3 %A A009168 _R. H. Hardin_ %E A009168 Extended and signs tested Mar 15 1997 by _Olivier Gérard_.