OFFSET
0,4
COMMENTS
sec(x) = 1/cos(x).
FORMULA
E.g.f.: sec(x)^tanh(x).
MAPLE
a:= n-> n!* coeff(series(sec(x)^tanh(x), x, n+1), x, n):
seq (a(n), n=0..25); # Alois P. Heinz, Aug 20 2012
MATHEMATICA
f[x_] := Sec[x]^Tanh[x]; Table[Derivative[n] [f][0], {n, 0, 25}]
CROSSREFS
KEYWORD
sign
AUTHOR
Michel Lagneau, Aug 20 2012
STATUS
approved