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A012220 cosh(arctan(arcsinh(x)))=1+1/2!*x^2-11/4!*x^4+349/6!*x^6-22007/8!*x^8... 0

%I #6 Nov 06 2020 16:12:18

%S 1,1,-11,349,-22007,2312601,-365164227,80916522933,-23968582079343,

%T 9151870592718513,-4378918837383018747,2566828786036427906445,

%U -1809533477302236292739175,1510703360292377534570508105

%N cosh(arctan(arcsinh(x)))=1+1/2!*x^2-11/4!*x^4+349/6!*x^6-22007/8!*x^8...

%t With[{nn=30},Take[CoefficientList[Series[Cosh[ArcTan[ArcSinh[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Nov 06 2020 *)

%K sign

%O 0,3

%A Patrick Demichel (patrick.demichel(AT)hp.com)

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Last modified March 4 07:29 EST 2024. Contains 370522 sequences. (Running on oeis4.)