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A009309
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Expansion of log(1+log(1+sinh(x))).
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0
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0, 1, -2, 8, -43, 299, -2566, 26200, -310458, 4190709, -63507976, 1067945504, -19737313696, 397714143007, -8678720911680, 203901057411888, -5131882643803216, 137757901532413673, -3928752297641273728
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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) / (arcsinh(1-exp(-1)))^n. - Vaclav Kotesovec, Jan 22 2015
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MATHEMATICA
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Log[ 1+Log[ 1+Sinh[ x ] ] ]
CoefficientList[Series[Log[1 + Log[1 + Sinh[x]]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 22 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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