%I #6 May 07 2021 17:02:40

%S 1,1,9,393,33009,4410033,872617017,240500373753,88094910348129,

%T 41401437242599905,24287046275803547625,17396048031084882189033,

%U 14941352753081733849348945,15157924050230673397966293393

%N arctan(arcsin(tan(x)))=x+1/3!*x^3+9/5!*x^5+393/7!*x^7+33009/9!*x^9...

%t With[{nn=30},Take[CoefficientList[Series[ArcTan[ArcSin[Tan[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, May 07 2021 *)

%K nonn

%O 0,3

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