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A009167
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Expansion of cosh(tan(x)/cos(x)).
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0
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1, 1, 21, 717, 38857, 3158329, 363525789, 56250039237, 11210469917713, 2783865475754737, 840008000833503141, 302092032859131150141, 127513257396264637784281, 62381091849825754078253353
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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[Tan[x]/Cos[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Feb 11 2015 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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