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A012086 sech(arcsin(tan(x)))=1-1/2!*x^2-7/4!*x^4-121/6!*x^6-5167/8!*x^8... 0

%I #6 Sep 17 2023 15:25:41

%S 1,-1,-7,-121,-5167,-487441,-78804727,-18558463561,-5919443326687,

%T -2457116797560481,-1289150916753299047,-834798631079038210201,

%U -654139310316332313889807,-610085118687493622960844721

%N sech(arcsin(tan(x)))=1-1/2!*x^2-7/4!*x^4-121/6!*x^6-5167/8!*x^8...

%t With[{nn=30},Take[CoefficientList[Series[Sech[ArcSin[Tan[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Sep 17 2023 *)

%K sign

%O 0,3

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

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)