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 A009234 #13 Feb 09 2014 04:05:20
%S A009234 1,1,1,5,17,77,457,2641,19777,149529,1305489,12183613,122670033,
%T A009234 1342074021,15462740633,192192501897,2502900454401,34713417890609,
%U A009234 504155298072609,7713202738776565,123438576028985873
%N A009234 Expansion of e.g.f.: exp(sinh(x)/cos(x)).
%H A009234 Vincenzo Librandi, <a href="/A009234/b009234.txt">Table of n, a(n) for n = 0..200</a>
%t A009234 With[{nn=20},CoefficientList[Series[Exp[Sinh[x]/Cos[x]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Dec 07 2013 *)
%K A009234 nonn,easy
%O A009234 0,4
%A A009234 _R. H. Hardin_
%E A009234 Extended and signs tested by _Olivier Gérard_, Mar 15 1997
%E A009234 Definition clarified and prior Mathematica program replaced by _Harvey P. Dale_, Dec 07 2013