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A136606
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Reduced denominators in the Maclaurin series for the Gudermannian.
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0
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1, 6, 24, 5040, 72576, 39916800, 95800320, 1307674368000, 4184557977600, 121645100408832000, 2043637686868377600, 25852016738884976640000, 238634000666630553600000, 10888869450418352160768000000
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OFFSET
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1,2
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LINKS
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EXAMPLE
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x - x^3/6 + x^5/24 - (61*x^7)/5040 + (277*x^9)/72576 - ...
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MATHEMATICA
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gd[x_] := 2*ArcTan[(E^x - 1)/(E^x + 1)]; CoefficientList[ Series[gd[x], {x, 0, 28}]/x , x^2] // Denominator (* Jean-François Alcover, Nov 09 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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STATUS
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approved
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