OFFSET
0,2
FORMULA
a(n) ~ (2*n)! * (exp(1) + exp(-1)) / (Pi/2)^(2*n+1). - Vaclav Kotesovec, Jan 22 2015
MATHEMATICA
Cosh[ Sin[ x ] ]/Cos[ x ] (* Even Part *)
nn = 20; Table[(CoefficientList[Series[Cosh[Sin[x]]*Sec[x], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Jan 22 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended and signs tested Mar 15 1997 by Olivier Gérard.
STATUS
approved