OFFSET
0,2
EXAMPLE
2*x - 1/2!*x^2 + 20/3!*x^3 - 54/4!*x^4 + 940/5!*x^5 ...
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Tan[ArcTanh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 12 2019 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0)=0 inserted and title improved by Sean A. Irvine, Jul 31 2018
STATUS
approved