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A009176
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Expansion of e.g.f.: cosh(x)*cos(tan(x)).
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0
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1, 0, -12, -216, -5296, -168128, -5391680, 38412672, 61881368832, 16576603568128, 4120672559178752, 1085659391947229184, 313198080458495610880, 99633528964523733598208, 34860299883730859703910400
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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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 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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