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A009369
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Expansion of log(1+tan(x))*cos(x).
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0
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0, 1, -1, 1, -8, 45, -301, 2357, -21608, 223769, -2602081, 33484713, -473210528, 7282225093, -121272163741, 2172791685469, -41680241726768, 852337358029617, -18510436676621281, 425474580069715025, -10319766893265298328
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OFFSET
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0,5
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LINKS
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FORMULA
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a(n) ~ (n-1)! * (-1)^(n+1) * 2^(2*n-1/2) / Pi^n. - Vaclav Kotesovec, Jan 23 2015
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MATHEMATICA
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Log[ 1+Tan[ x ] ]*Cos[ x ]
CoefficientList[Series[Cos[x]*Log[1 + Tan[x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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