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A012564
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sec(sinh(x)*arctan(x))=1+12/4!*x^4-120/6!*x^6+15120/8!*x^8...
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0
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1, 0, 12, -120, 15120, -1003200, 175323456, -30612097152, 8428742150400, -2694273274447872, 1128666024421563392, -559638290295925823488, 336992041752644836265984, -237186459370976230365020160
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..13.
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sec[Sinh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jul 04 2019 *)
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CROSSREFS
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Sequence in context: A012441 A012373 A012620 * A012442 A262204 A037097
Adjacent sequences: A012561 A012562 A012563 * A012565 A012566 A012567
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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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