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A009356
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Expansion of log(1+sinh(x))/exp(x).
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5
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0, 1, -3, 9, -32, 140, -757, 4963, -38376, 341664, -3438641, 38576747, -477118600, 6447914668, -94515392805, 1493405394411, -25300960235504, 457490990665952, -8793604786338049, 179039287811168755, -3849069823206873888
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) ~ (n-1)! * (-1)^(n+1) * (1+sqrt(2)) / (log(1+sqrt(2)))^n. - Vaclav Kotesovec, Jan 23 2015
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MATHEMATICA
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Log[ 1+Sinh[ x ] ]/Exp[ x ]
CoefficientList[Series[Log[1 + Sinh[x]]/E^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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