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A009234
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Expansion of e.g.f.: exp(sinh(x)/cos(x)).
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2
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1, 1, 1, 5, 17, 77, 457, 2641, 19777, 149529, 1305489, 12183613, 122670033, 1342074021, 15462740633, 192192501897, 2502900454401, 34713417890609, 504155298072609, 7713202738776565, 123438576028985873
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Exp[Sinh[x]/Cos[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 07 2013 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Dec 07 2013
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STATUS
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approved
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