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%I
%S 1,3,45,1071,56697,3279419,376156261,35274762407,8003761282417,
%T 853554115621363,450081179390735645,17369944484313961631,
%U 62576187908645427074025,-11407841475969056406389973
%N sinh(sec(x)*arcsinh(x))=x+3/3!*x^3+45/5!*x^5+1071/7!*x^7+56697/9!*x^9...
%t With[{nn=30},Take[CoefficientList[Series[Sinh[Sec[x]ArcSinh[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Mar 08 2018 *)
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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