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sinh(arcsin(tanh(x)))=x-4/5!*x^5+80/7!*x^7-2224/9!*x^9+88960/11!*x^11...
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%I #6 Aug 08 2019 15:48:39

%S 1,0,-4,80,-2224,88960,-4942144,366928640,-35219691264,4251941253120,

%T -631113275843584,113005305852006400,-24021321751206703104,

%U 5979261710118927892480

%N sinh(arcsin(tanh(x)))=x-4/5!*x^5+80/7!*x^7-2224/9!*x^9+88960/11!*x^11...

%t With[{nn=30},Take[CoefficientList[Series[Sinh[ArcSin[Tanh[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Aug 08 2019 *)

%K sign

%O 0,3

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