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A009176
Expansion of e.g.f.: cosh(x)*cos(tan(x)).
0
1, 0, -12, -216, -5296, -168128, -5391680, 38412672, 61881368832, 16576603568128, 4120672559178752, 1085659391947229184, 313198080458495610880, 99633528964523733598208, 34860299883730859703910400
OFFSET
0,3
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Cosh[x]*Cos[Tan[x]], {x, 0, nn}], x] Range[ 0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 11 2020 *)
CROSSREFS
Sequence in context: A034788 A082165 A006689 * A374892 A087585 A297503
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Previous Mathematica program replaced by Harvey P. Dale, May 11 2020
STATUS
approved