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A012799 sec(sec(x)*tan(x))=1+1/2!*x^2+25/4!*x^4+1177/6!*x^6+98705/8!*x^8... 0

%I #6 Sep 11 2023 12:02:10

%S 1,1,25,1177,98705,13250769,2607761385,707007382057,252591724020385,

%T 115013019820614177,65019184411131252025,44683093185748102178361,

%U 36687179790948560158256945,35468646820376578609567141873

%N sec(sec(x)*tan(x))=1+1/2!*x^2+25/4!*x^4+1177/6!*x^6+98705/8!*x^8...

%t With[{nn=30},Take[CoefficientList[Series[Sec[Sec[x]Tan[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Sep 11 2023 *)

%K nonn

%O 0,3

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

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Last modified July 13 08:08 EDT 2024. Contains 374274 sequences. (Running on oeis4.)