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%I #13 Jan 27 2014 09:13:01
%S 1,5,101,4689,381769,47849053,8532452397,2051184222377,
%T 639121206054545,250473754883360181,120568689462321176053,
%U 69926680208791530760705,48091629862193464534126041
%N Expansion of tan(x/cos(x)).
%t With[{nn=30},Take[CoefficientList[Series[Tan[x/Cos[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Jan 06 2012 *)
%K nonn
%O 0,2
%A _R. H. Hardin_
%E Extended and signs tested Mar 15 1997 by _Olivier Gérard_.