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A013450
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exp(tan(x)-arcsinh(x)) = 1+3/3!*x^3+7/5!*x^5+90/6!*x^6+497/7!*x^7...
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1
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1, 0, 0, 3, 0, 7, 90, 497, 1176, 4471, 185094, 1537877, 1964028, -3633797, 1848048202, 22918664225, -75962374768, -1620122697905, 67890529994062, 1135357942624877, -11941170933349628, -252473078493886301
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OFFSET
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0,4
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LINKS
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FORMULA
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a(n) ~ -2*cos(Pi*n/2-tanh(1)) * n^(n-1) / exp(n). - Vaclav Kotesovec, Nov 01 2013
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MATHEMATICA
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CoefficientList[Series[Exp[Tan[x]-ArcSinh[x]], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Nov 01 2013 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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STATUS
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approved
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