OFFSET
0,4
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Exp[ArcTan[x]-ArcTanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 25 2016 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, May 25 2016
STATUS
approved