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A009433
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Expansion of log(1+x)/cosh(tan(x)).
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0
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0, 1, -1, -1, 0, -11, 15, 27, -504, 11817, -94185, 1226455, -12442056, 155936221, -1995562569, 27870901107, -423463160400, 6793396567633, -117302680146033, 2130615128588591, -40960288523646320, 827190717641773765
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OFFSET
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0,6
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LINKS
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Table of n, a(n) for n=0..21.
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FORMULA
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a(n) ~ (n-1)! * (-1)^(n+1) / cosh(tan(1)). - Vaclav Kotesovec, Jan 23 2015
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MATHEMATICA
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Log[ 1+x ]/Cosh[ Tan[ x ] ]
CoefficientList[Series[Log[1 + x]*Sech[Tan[x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
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CROSSREFS
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Sequence in context: A214863 A094766 A009407 * A275242 A030099 A085597
Adjacent sequences: A009430 A009431 A009432 * A009434 A009435 A009436
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KEYWORD
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sign,easy
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
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STATUS
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approved
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