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A013204
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E.g.f. log(sech(x) + tan(x)).
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1
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0, 1, -2, 7, -24, 165, -1232, 10827, -111104, 1316585, -17449472, 257028847, -4164086784, 73616009805, -1409671718912, 29070305745267, -642304219480064, 15137914082015825, -379068532960919552, 10050622525103392087, -281286704647327186944
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OFFSET
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0,3
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LINKS
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EXAMPLE
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Log(sech(x) + tan(x)) = x -2/2!*x^2 +7/3!*x^3 -24/4!*x^4 +165/5!*x^5 - ...
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MATHEMATICA
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a[n_] := SeriesCoefficient[Log[Sech[x] + Tan[x]], {x, 0, n}] n!;
With[{nn=20}, CoefficientList[Series[Log[Sech[x]+Tan[x]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Oct 19 2018 *)
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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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EXTENSIONS
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STATUS
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approved
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