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