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A012882
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Expansion of e.g.f.: exp(sech(x)*arctanh(x))=1+x+1/2!*x^2-3/4!*x^4+20/5!*x^5+165/6!*x^6...
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0
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1, 1, 1, 0, -3, 20, 165, 784, 1337, 26256, 356745, 4466176, 31874997, 435729216, 5714452653, 104111460608, 1296863374193, 23261262303488, 357091592679441, 7794968497086464, 131690816886952045
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OFFSET
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0,5
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Exp[Sech[x]ArcTanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Feb 15 2019 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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