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A009319
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Expansion of log(1+log(1+x)*cos(x)).
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0
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0, 1, -2, 4, -17, 93, -649, 5381, -51778, 565957, -6930141, 93992413, -1399244076, 22689478823, -398164266655, 7519118564551, -152058873978384, 3278894568674073, -75103386737309385, 1821102601528126265
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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) / r^n, where r = 0.7426973079865501887067225087448265047287233394318... is the root of the equation exp(1/cos(r))*(r-1) = -1. - Vaclav Kotesovec, Jan 24 2015
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MATHEMATICA
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Log[ 1+Log[ 1+x ]*Cos[ x ] ]
CoefficientList[Series[Log[1 + Cos[x]*Log[1 + x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 24 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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