OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
EXAMPLE
x + 2/2!*x^2 - 1/3!*x^3 - 28/4!*x^4 - 115/5!*x^5 ...
MAPLE
seq(coeff(series(factorial(n)*arctan(tanh(x)*exp(x)), x, n+1), x, n), n=0..25); # Muniru A Asiru, Jul 24 2018
MATHEMATICA
With[{nn=25}, Drop[CoefficientList[Series[ArcTan[Tanh[x] Exp[x]], {x, 0, nn}], x] Range[0, nn]!]] (* Vincenzo Librandi, Jul 24 2018 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0) inserted and title improved by Sean A. Irvine, Jul 23 2018
STATUS
approved