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A012608
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sec(arcsinh(x)*arcsin(x)) = 1+12/4!*x^4+13328/8!*x^8+117619392/12!*x^12...
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0
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1, 12, 13328, 117619392, 4062867095808, 388601301012237312, 83771183547685073326080, 35504181228757953494366208000, 26841389346007019483917993990225920, 33654478025536204699103406849552997416960, 66134661422427811384963352725241987600886005760
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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[Sec[ArcSinh[x]ArcSin[x]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 4}]] (* Harvey P. Dale, Apr 09 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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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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More terms from Harvey P. Dale, Apr 09 2012
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STATUS
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approved
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