OFFSET
0,3
EXAMPLE
x + 2/2!*x^2 - 1/3!*x^3 - 28/4!*x^4 - 115/5!*x^5 ...
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Tanh[ArcTan[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 13 2018 *)
PROG
(PARI) my(x = 'x + O('x^30)); concat([0], Vec(serlaplace(tanh(atan(x) * exp(x))))) \\ Michel Marcus, Jul 19 2018
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0) inserted and title improved by Sean A. Irvine, Jul 18 2018
STATUS
approved