Ok, I've attached a screenshot of what I got out of Excel. Quite a nice polynomial fit to the log plot of the data. The result is this:

with

That's as good a fit as it gets. Here's the plot:

I realize this function is not of the form you were looking for, but this is as good as Excel gets.

Because computers make fast, very accurate,

*mistakes*. You absolutely must know what the computer is doing, and you must have some idea of the result you want to obtain before you can possibly accept its answer. Computers are very stupid: they do what you tell them, not what you want. Big difference!