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A013406
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sech(arcsin(x)-tan(x))=1-10/6!*x^6-392/8!*x^8-11814/10!*x^10...
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0
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1, 0, 0, -10, -392, -11814, 496012, 255399014, 69358453968, 19258160456306, 6077931425640244, 2258231645186973342, 999755491596900217336, 527324363004530542073450, 328862882324660659119175452
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sech[ArcSin[x]-Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 30 2021 *)
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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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STATUS
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approved
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