A012628 - OEIS

%I #7 Dec 30 2012 10:56:17

%S 2,-12,118,168,-72918,-19180260,7673967390,-1668580628400,

%T 206209417380690,17149380702207300,-8171629445251404090,

%U -13542042383228350058760,18432243823017229137614970

%N arcsinh(arcsinh(x)*arctan(x))=2/2!*x^2-12/4!*x^4+118/6!*x^6+168/8!*x^8...

%t With[{nn=30},Rest[Take[CoefficientList[Series[ArcSinh[ ArcSinh[x] ArcTan[x]],{x,0,nn}],x]Range[0,nn]!,{1,-1,2}]]] (* _Harvey P. Dale_, Dec 30 2012 *)

%K sign

%O 0,1

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