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A012144
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sec(arcsin(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+769/6!*x^6+66849/8!*x^8...
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0
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1, 1, 17, 769, 66849, 9506241, 2007271089, 589807203777, 230194642564161, 115219444193968257, 71962921603647030609, 54865853223458268869505, 50151129904368572197783905, 54139213630083955379966633025
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sec[ArcSin[ArcTanh[x]]], {x, 0, nn}], x] Range[ 0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jun 22 2022 *)
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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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STATUS
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approved
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