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A009264
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Expansion of e.g.f.: exp(tanh(x))/cos(x).
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2
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1, 1, 2, 2, 4, 12, 128, 464, 1296, 336, 85600, 838752, 4372160, -11036608, 148860416, 5128035072, 54261590272, -109537337088, -1474575037952, 68456854604288, 1579094994228224, 1239349299477504, -145025202842173440
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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}, CoefficientList[Series[Exp[Tanh[x]]/Cos[x], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 14 2018 *)
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CROSSREFS
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KEYWORD
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sign,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, Mar 14 2018
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STATUS
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approved
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