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A012205
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arctan(arctan(arctan(x)))=x-6/3!*x^3+192/5!*x^5-14704/7!*x^7...
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0
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1, -6, 192, -14704, 2058624, -457982720, 148443124736, -66066559066112, 38672430452342784, -28812765976119148544, 26627757204719641296896, -29895731887419723149213696, 40082507396600200285753704448
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[ArcTan[ArcTan[ArcTan[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Ray Chandler, Nov 28 2016 *)
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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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