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A012374
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sech(tan(x)*sin(x))=1-12/4!*x^4-120/6!*x^6+4368/8!*x^8...
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0
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1, 0, -12, -120, 4368, 327360, -762432, -2379861120, -176278202112, 34929443235840, 10554181240931328, -234919154252175360, -852275452306594394112, -157606057918154970808320
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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[Sech[Tan[x]Sin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jan 31 2016 *)
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CROSSREFS
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Sequence in context: A221493 A009149 A010570 * A012615 A012559 A009164
Adjacent sequences: A012371 A012372 A012373 * A012375 A012376 A012377
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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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