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%I #7 Nov 21 2013 12:46:00
%S 1,-1,-3,-69,-3335,-289801,-39612939,-7845054541,-2125704833551,
%T -755532171928081,-341044077485199379,-190581499954444336725,
%U -129146418452087275163415,-104328785204254369631603225
%N sech(arcsin(arcsin(x)))=1-1/2!*x^2-3/4!*x^4-69/6!*x^6-3335/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sech[ArcSin[ArcSin[x]]],{x,0, nn}], x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Dec 25 2011 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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