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A012675
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sech(tanh(x)*tan(x))=1-12/4!*x^4+2128/8!*x^8+3482688/12!*x^12...
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0
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1, -12, 2128, 3482688, -28510476032, -29203453996032, 18429307563035250688, -709977989050867131727872, -146234048852276431866584563712, 20573909798214617779391304930951168
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history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=40}, Take[CoefficientList[Series[Sech[Tanh[x]Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -2, 4}]] (* Harvey P. Dale, Sep 10 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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