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%I #6 Aug 25 2020 18:25:46
%S 1,1,5,61,937,41881,259181,225924245,-25529526319,8376428366257,
%T -2542034772205739,1049519923013252461,-506849756298097166215,
%U 294020276106503596553801,-199395048123852155910464323
%N cosh(tan(arcsinh(x)))=1+1/2!*x^2+5/4!*x^4+61/6!*x^6+937/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Cosh[Tan[ArcSinh[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Aug 25 2020 *)
%Y A012167(n)=A012159(2*n)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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