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A009682
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Expansion of tan(sinh(x))*sin(x).
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1
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0, 2, 8, 168, 6208, 365984, 31759232, 3799039104, 599327352832, 120551382086144, 30112348370954240, 9144842254707320832, 3318219571077818269696, 1417778434388262802202624
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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)! * 4 * sin(arcsinh(Pi/2)) / (sqrt(4+Pi^2) * arcsinh(Pi/2)^(2*n+1)). - Vaclav Kotesovec, Jan 23 2015
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MATHEMATICA
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Tan[ Sinh[ x ] ]*Sin[ x ] (* Even Part *)
nn = 20; Table[(CoefficientList[Series[Sin[x]*Tan[Sinh[x]], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Jan 23 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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