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A013321
E.g.f.: sech(exp(x)-cos(x)).
0
1, 0, -1, -6, -11, 80, 923, 3682, -26567, -585120, -3969849, 24427370, 948294477, 9793100720, -42570639997, -3129194240622, -45887540775759, 90022891149760, 18204741288946383, 363299569735984474
OFFSET
0,4
EXAMPLE
sech(exp(x)-cos(x)) = 1 -x^2/2! -6*x^3/3! -11*x^4/4! +80*x^5/5! ...
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Sech[Exp[x]-Cos[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 06 2015 *)
CROSSREFS
Sequence in context: A283820 A332659 A219702 * A192893 A188599 A217934
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved