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A009144
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Expansion of cosh(sin(x))/cos(x).
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0
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1, 2, 8, 88, 2176, 78080, 4159616, 307882240, 29920681984, 3710767394816, 571523842998272, 107010484096565248, 23940179383147724800, 6306683724617339961344, 1932337463823712544620544
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) ~ (2*n)! * (exp(1) + exp(-1)) / (Pi/2)^(2*n+1). - Vaclav Kotesovec, Jan 22 2015
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MATHEMATICA
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Cosh[ Sin[ x ] ]/Cos[ x ] (* Even Part *)
nn = 20; Table[(CoefficientList[Series[Cosh[Sin[x]]*Sec[x], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Jan 22 2015 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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