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 A009240 #8 Jan 27 2014 09:12:47 %S A009240 1,1,1,5,17,113,673,5669,48033,494081,5387009,65835109,871869745, %T A009240 12394430129,192177458593,3124415825605,55316788832065, %U A009240 1014225530028161,20139680768683777,411568350375102789 %N A009240 Expansion of exp(tan(tan(x))). %t A009240 Exp[ Tan[ Tan[ x ] ] ] %K A009240 nonn,easy %O A009240 0,4 %A A009240 _R. H. Hardin_ %E A009240 Extended and signs tested Mar 15 1997 by _Olivier Gérard_.