A013043 - OEIS

%I #6 Feb 10 2016 17:22:52

%S 1,-4,64,-2464,176000,-20274304,3418964992,-795860555520,

%T 244118384340992,-95517422279237632,46396805200416325632,

%U -27406009571869059219456,19339103621838228194852864

%N sech(sinh(x)+arcsin(x))=1-4/2!*x^2+64/4!*x^4-2464/6!*x^6...

%t With[{nn=30},Take[CoefficientList[Series[Sech[Sinh[x]+ArcSin[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Feb 10 2016 *)

%K sign

%O 0,2

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