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%I #6 Jun 03 2023 11:24:08
%S 1,0,-12,-240,1680,660480,39530304,-3855231744,-1466146656000,
%T -147651751649280,43245441015313408,21785411128189063168,
%U 453349606338812022784,-4374564365537166405795840
%N sech(sinh(x)*arcsin(x))=1-12/4!*x^4-240/6!*x^6+1680/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sech[Sinh[x]ArcSin[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Jun 03 2023 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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