|
%I #6 Mar 19 2020 17:10:31
%S 1,-1,-3,-21,-1543,-139241,-17567883,-3247844861,-820544875023,
%T -270409929116881,-112752402237298963,-58042577464009155301,
%U -36153625550535244615703,-26800108152000698851560121
%N sech(arcsin(sinh(x)))=1-1/2!*x^2-3/4!*x^4-21/6!*x^6-1543/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sech[ArcSin[Sinh[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Mar 19 2020 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
|
