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A012255
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Expansion of e.g.f.: exp(tanh(arcsin(x)))=1+x+1/2!*x^2-3/4!*x^4-4/5!*x^5+21/6!*x^6...
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0
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1, 1, 1, 0, -3, -4, 21, 136, 185, 272, 9641, 222016, 1668021, 21267520, 192801597, 3836913536, 42064398961, 874251520256, 10576096455505, 254117293340672, 3476312353756781, 92635637659667456
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history;
text;
internal format)
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OFFSET
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0,5
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LINKS
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Exp[Tanh[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 30 2019 *)
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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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