You can create such a table yourself (although I dont understand how you get the interpolation function without having such a table in the first place? So I might simply not understand what you mean)
In the curve fitting tool, take your interpolant fit (its down in the table of fits in the bottom), rightclick it, and save to workspace. The default name is fittedmodel but you can name it whatever.
Then - for example, if your x is x=[1 2 3 4 5];, you can simply type in the command window y=fittedmodel(x), and then you have it.