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 A009204 #14 Feb 09 2014 04:06:06
%S A009204 1,1,1,-2,-11,8,253,344,-9463,-44416,491609,5130368,-30257347,
%T A009204 -688030080,1480493589,109875416832,177416283793,-20650894622720,
%U A009204 -125705754161615,4460981432725504,53738108098148101,-1069938200055119872
%N A009204 Expansion of e.g.f. exp(sin(tanh(x))).
%H A009204 Vincenzo Librandi, <a href="/A009204/b009204.txt">Table of n, a(n) for n = 0..200</a>
%t A009204 With[{nn=30},CoefficientList[Series[Exp[Sin[Tanh[x]]],{x,0,nn}], x] Range[0,nn]!] (* _Harvey P. Dale_, Jun 16 2013 *)
%K A009204 sign,easy
%O A009204 0,4
%A A009204 _R. H. Hardin_
%E A009204 Extended with signs by _Olivier Gérard_, Mar 15 1997
%E A009204 Definition clarified and Mathematica program replaced by _Harvey P. Dale_, Jun 16 2013