OFFSET
0,4
FORMULA
Lim sup n->infinity (|a(n)|/n!)^(1/n) = 1.25977488234489... = abs(1/r), where r is the complex root of the equation 1+r = exp(-I/cos(r)). - Vaclav Kotesovec, Nov 02 2013
MATHEMATICA
CoefficientList[Series[ArcSinh[Cos[x]*Log[x+1]], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Oct 30 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Prepended missing a(0)=0 from Vaclav Kotesovec, Nov 02 2013
STATUS
approved