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%I #6 Jul 27 2022 19:09:59
%S 1,-1,13,-373,19545,-1638569,201324773,-34084249501,7606559175089,
%T -2164004651794513,764464999664782013,-328322677491890500805,
%U 168474698667902836871177,-101798128590699775451705081
%N sech(sin(sin(x)))=1-1/2!*x^2+13/4!*x^4-373/6!*x^6+19545/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sech[Sin[Sin[x]]],{x,0,nn}],x] Range[ 0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Jul 27 2022 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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