OFFSET
0,2
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Exp[ArcTan[x]+Tan[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jul 07 2019 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, Jul 07 2019
STATUS
approved