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A009680
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E.g.f. tan(sinh(x))*cos(x) (odd powers only).
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0
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1, 0, 12, 336, 15760, 1144704, 117385920, 16206548736, 2897776619776, 651455951990784, 179856295521635328, 59822762558026321920, 23594335379577078059008, 10887666560228980302446592
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) ~ (2*n-1)! * 4 * cos(arcsinh(Pi/2)) / (sqrt(4 + Pi^2) * arcsinh(Pi/2)^(2*n)). - Vaclav Kotesovec, Jan 24 2015
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tan[Sinh[x]]*Cos[x], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Apr 01 2012 *)
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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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