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A102073
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Numerators of e.g.f. sec(arccosh(x)) = cosec(arcsinh(x)).
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1
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1, -1, 220, -830, 51280, -24271600, 2978372800, -72656038000, 6574942704928000, -369025338813664000, 439973927875730560000, -16173932272478277440000, 8586787143256164544000000
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OFFSET
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1,3
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LINKS
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EXAMPLE
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sec(arccosh(x)) = 1/x + x/3 - 1/3*x^3/3! + 220/63*x^5/5! - ...
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MATHEMATICA
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terms = 13; s = -1/x + Csc[ArcSinh[x]] + O[x]^(2 terms) // Normal;
CoefficientList[s, x] * Range[0, 2 terms - 1]! // DeleteCases[#, 0]& // Numerator (* Jean-François Alcover, Jul 23 2017 *)
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CROSSREFS
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KEYWORD
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sign,frac
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AUTHOR
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STATUS
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approved
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