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A009698
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Expansion of tan(tan(x))*sin(x).
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1
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0, 2, 12, 358, 19352, 1709194, 222722596, 40122780142, 9543330683696, 2895895566420498, 1091590070839432764, 500335689476146083190, 274027979513688992336584, 176734166480671985581245594
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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)! * 8 * Pi / ((4+Pi^2)^(3/2) * arctan(Pi/2)^(2*n+1)). - Vaclav Kotesovec, Jan 23 2015
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MATHEMATICA
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Tan[ Tan[ x ] ]*Sin[ x ] (* Even Part *)
nn = 20; Table[(CoefficientList[Series[Sin[x]*Tan[Tan[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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