OFFSET
0,3
FORMULA
a(n) ~ (n-1)!/2 * (-1)^n / (1-exp(r))^n, where r = -1.4265092278500059... is the root of the equation exp(2/r) + 2*exp(1/r) - 2*exp((r^2+1)/r) = 1. - Vaclav Kotesovec, Oct 31 2013
MATHEMATICA
CoefficientList[Series[ArcTanh[ArcSinh[x]*Log[x+1]], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Oct 31 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Prepended missing a(0)=0, a(1)=0, Vaclav Kotesovec, Oct 31 2013
STATUS
approved