OFFSET
0,2
EXAMPLE
2*x - 3/2!*x^2 + 13/3!*x^3 - 74/4!*x^4 + 573/5!*x^5 ...
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