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A012663
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Expansion of e.g.f.: sech(tanh(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-11/4!*x^4+100/5!*x^5...
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0
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1, 0, -1, -6, -11, 100, 1043, 2702, -47287, -697656, -2382009, 65150690, 1227815037, 4876299948, -197964434917, -4452683466122, -19212329422319, 1119650941512592, 28926172679801103, 128264089711760074
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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[Sech[Tanh[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 23 2013 *)
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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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