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A013321
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E.g.f.: sech(exp(x)-cos(x)).
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0
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1, 0, -1, -6, -11, 80, 923, 3682, -26567, -585120, -3969849, 24427370, 948294477, 9793100720, -42570639997, -3129194240622, -45887540775759, 90022891149760, 18204741288946383, 363299569735984474
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OFFSET
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0,4
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LINKS
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EXAMPLE
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sech(exp(x)-cos(x)) = 1 -x^2/2! -6*x^3/3! -11*x^4/4! +80*x^5/5! ...
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Sech[Exp[x]-Cos[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 06 2015 *)
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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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STATUS
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approved
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