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A009159 Expansion of cosh(tan(x))*cos(x). 0

%I

%S 1,0,4,56,1744,86208,6199744,608357504,77889982720,12588540708864,

%T 2503565961032704,600347512023062528,170721835772956659712,

%U 56780394898390577528832,21828678118361789793746944

%N Expansion of cosh(tan(x))*cos(x).

%t With[{nn=30},Take[CoefficientList[Series[Cosh[Tan[x]]*Cos[x],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Jul 28 2019 *)

%K nonn

%O 0,3

%A _R. H. Hardin_

%E Extended and signs tested Mar 15 1997 by _Olivier GĂ©rard_.

%E Previous Mathematica program replaced by _Harvey P. Dale_, Jul 28 2019

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Last modified July 12 12:18 EDT 2020. Contains 335661 sequences. (Running on oeis4.)