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A012879
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Expansion of e.g.f.: exp(sech(x)*arctan(x))=1+x+1/2!*x^2-4/3!*x^3-19/4!*x^4+20/5!*x^5...
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0
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1, 1, 1, -4, -19, 20, 565, 1024, -24743, -147568, 1450985, 19148736, -100090043, -2934842560, 5608180253, 551525234688, 703874231473, -127249126657792, -601015521145391, 35789287036394496, 309193460848468125
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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[Sech[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 22 2017 *)
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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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