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A012552
sec(sinh(x)*tan(x))=1+12/4!*x^4+360/6!*x^6+21392/8!*x^8...
0
1, 0, 12, 360, 21392, 2157120, 312620352, 62372069760, 16405335464192, 5496449323898880, 2285903378752576512, 1155546066959150254080, 697824091645377743654912, 496179920290601448240168960
OFFSET
0,3
MATHEMATICA
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 *)
CROSSREFS
Sequence in context: A327986 A279182 A002674 * A012385 A012430 A012632
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved