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A009208
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Expansion of exp(sin(x))/cosh(x).
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0
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1, 1, 0, -3, -4, 17, 56, -203, -1072, 5473, 34368, -254067, -1781440, 16540721, 132000896, -1419027899, -12912385792, 156472224961, 1604411553792, -21673957780323, -247155791205376, 3688273509233489, 46275148760619008
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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! * cos(Pi*n/2 - sinh(Pi/2)) * 2^(n+2) / Pi^(n+1). - Vaclav Kotesovec, Jul 02 2015
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MATHEMATICA
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CoefficientList[Series[Exp[Sin[x]]/Cosh[x], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jul 02 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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