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%I #6 Mar 19 2016 14:10:24
%S 1,-1,5,-109,4073,-295161,30105261,-4622444709,920180967249,
%T -244553774342769,80285311139524821,-32887829518696856925,
%U 16096767138947015536185,-9423401435342942243589225
%N sech(arcsin(arcsinh(x)))=1-1/2!*x^2+5/4!*x^4-109/6!*x^6+4073/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sech[ArcSin[ArcSinh[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Mar 19 2016 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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