OFFSET
0,2
FORMULA
a(n) ~ (-1)^(n+1) * (n-1)! / r^n, where r = -0.5858351763174495612608250547681201443693685684124819695... is the root of the equation 2*r*exp(exp(r)) = 1 - exp(2*exp(r)). - Vaclav Kotesovec, Feb 03 2015
MATHEMATICA
CoefficientList[Series[Log[E^x + ArcSinh[x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Feb 03 2015 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Prepended missing a(0)=0 from Vaclav Kotesovec, Feb 03 2015
STATUS
approved