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A009652
Expansion of tan(log(1+x)/cos(x)).
1
0, 1, -1, 7, -24, 215, -1515, 16721, -176568, 2363165, -32662125, 521810859, -8824531056, 165050184611, -3283420714119, 70591429387077, -1610563051907280, 39183483858949049, -1007242998864835257
OFFSET
0,4
LINKS
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Tan[Log[1+x]/Cos[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Feb 05 2012 *)
CROSSREFS
Sequence in context: A209342 A203117 A197791 * A012777 A074783 A286742
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved