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A012552
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sec(sinh(x)*tan(x))=1+12/4!*x^4+360/6!*x^6+21392/8!*x^8...
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0
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1, 0, 12, 360, 21392, 2157120, 312620352, 62372069760, 16405335464192, 5496449323898880, 2285903378752576512, 1155546066959150254080, 697824091645377743654912, 496179920290601448240168960
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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[Sinh[x]Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Nov 12 2021 *)
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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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