User blog comment:Ynought/A pair of functions "Z and chi"/@comment-38080588-20190221184738

I am admittedly pretty confused  by your definition of this function. For example, how does \(a+1Z(a,n-1)\) reduce? But from what I can understand of it, I am fairly confident the growth rate is around \(f_5(n)\) and \(f_6(n)\) as upper bounds. It is possible that I have misinterpreted it somewhere.