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A009638
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Expansion of e.g.f.: tan(log(1+sinh(x))).
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0
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0, 1, -1, 5, -22, 151, -1186, 11255, -121752, 1493101, -20381896, 306816905, -5045231632, 89977880851, -1729461315856, 35637607318955, -783658693590912, 18315607922069401, -453368586519154816, 11848112075773043405
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OFFSET
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0,4
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LINKS
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FORMULA
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a(n) ~ n! * (-1)^(n+1) / (sqrt(1-2*exp(Pi/2)+2*exp(Pi)) * log(1 - exp(-Pi/2) + sqrt(1 + (exp(-Pi/2)-1)^2))^(n+1)). - Vaclav Kotesovec, Jan 23 2015
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MATHEMATICA
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CoefficientList[Series[Tan[Log[1 + Sinh[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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First Mathematica program deleted and definition clarified by Harvey P. Dale, Feb 20 2023
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STATUS
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approved
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