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A009297
Expansion of exp(x)/cosh(tan(x)).
2
1, 1, 0, -2, -8, -24, -56, -104, 512, 5824, 54912, 385408, 2590336, 15920256, 69311488, 160063744, -3936710656, -67251703808, -914002857984, -9821117788160, -81770855727104, -551206277726208, 2175764106870784, 106679023552528384
OFFSET
0,4
LINKS
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Exp[x]/Cosh[Tan[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Apr 22 2012 *)
CROSSREFS
Cf. A009107.
Sequence in context: A152132 A330520 A009059 * A235793 A182736 A083553
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved