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%I #6 Nov 12 2021 15:19:43
%S 1,0,12,360,21392,2157120,312620352,62372069760,16405335464192,
%T 5496449323898880,2285903378752576512,1155546066959150254080,
%U 697824091645377743654912,496179920290601448240168960
%N sec(sinh(x)*tan(x))=1+12/4!*x^4+360/6!*x^6+21392/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Sec[Sinh[x]Tan[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Nov 12 2021 *)
%K nonn
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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