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A013509
sinh(sec(x)-sech(x))=2/2!*x^2+242/6!*x^6+438722/10!*x^10...
0
2, 242, 438722, 3496736882, 79119810366722, 4053422315328489842, 407438035244753039317442, 72690404080321962122585230322, 21370388298881285712954829034618882, 9777171935777119106864269918684468443122, 6652045047862303555990692726103475288071112642
OFFSET
0,1
MATHEMATICA
With[{nn=50}, Take[CoefficientList[Series[Sinh[Sec[x]-Sech[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] (* Harvey P. Dale, Sep 24 2022 *)
CROSSREFS
Sequence in context: A146312 A109930 A309037 * A013472 A013505 A013478
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
More terms from N. J. A. Sloane, Dec 17 2011
STATUS
approved