OFFSET
0,4
MATHEMATICA
With[{nn=20}, Rest[CoefficientList[Series[Log[Sec[x]+ArcSinh[x]], {x, 0, nn}], x]Range[0, nn]!]] (* Harvey P. Dale, Jun 27 2012 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, Jun 27 2012
a(0)=0 inserted by Sean A. Irvine, Aug 01 2018
STATUS
approved