OFFSET
0,4
MAPLE
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Exp[Sec[x]-Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 14 2016 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
More terms from N. J. A. Sloane, Dec 17 2011
Definition clarified by Harvey P. Dale, Dec 14 2016
STATUS
approved