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A012415
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Expansion of e.g.f. tanh(arctan(x) * exp(x)).
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0
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0, 1, 2, -1, -28, -115, 230, 7051, 43080, -172327, -6067382, -47080361, 309697324, 12289126629, 114505019694, -1105109602973, -48948382516592, -522517588252495, 7065091754607762, 338212264324430255
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OFFSET
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0,3
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LINKS
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EXAMPLE
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x + 2/2!*x^2 - 1/3!*x^3 - 28/4!*x^4 - 115/5!*x^5 ...
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Tanh[ArcTan[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] * Harvey P. Dale, Dec 13 2018 *)
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PROG
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(PARI) x = 'x + O('x^30); concat([0], Vec(serlaplace(tanh(atan(x) * exp(x))))) \\ Michel Marcus, Jul 19 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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