OFFSET
0,4
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Sech[ArcTan[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 06 2016 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition (Name) clarified by Harvey P. Dale, Mar 06 2016
STATUS
approved