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A012374
sech(tan(x)*sin(x))=1-12/4!*x^4-120/6!*x^6+4368/8!*x^8...
0
1, 0, -12, -120, 4368, 327360, -762432, -2379861120, -176278202112, 34929443235840, 10554181240931328, -234919154252175360, -852275452306594394112, -157606057918154970808320
OFFSET
0,3
MATHEMATICA
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 *)
CROSSREFS
Sequence in context: A221493 A009149 A010570 * A012615 A012559 A009164
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved