OFFSET
0,2
EXAMPLE
2*x - 1/2!*x^2 + 17/3!*x^3 - 54/4!*x^4 + 677/5!*x^5 ...
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0) inserted and title improved by Sean A. Irvine, Jul 26 2018
STATUS
approved