%I #6 Apr 29 2018 17:16:32
%S 1,2,16,216,-1280,-1141504,-263392128,-64804059904,-18858549039104,
%T -6592583427379200,-2757743938862710784,-1367930584522073079808,
%U -796483574916192660455424,-539009967859883250211815424
%N sinh(sin(arctanh(x)))=x+2/3!*x^3+16/5!*x^5+216/7!*x^7-1280/9!*x^9...
%t With[{nn=30},Take[CoefficientList[Series[Sinh[Sin[ArcTanh[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Apr 29 2018 *)
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)