OFFSET
0,4
COMMENTS
The first negative number is a(24) = -686072407102337430543.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..200
EXAMPLE
exp(sec(x)*arcsinh(x)) = 1 + x + 1/2!*x^2 + 3/3!*x^3 + 9/4!*x^4 + 45/5!*x^5 + ...
PROG
(PARI) seq(n)={my(x='x+O('x^n)); Vec(serlaplace(exp(asinh(x)/cos(x))))} \\ Andrew Howroyd, Feb 25 2018
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved