An implementation of the Gaussian Hypergeometric function (and its dependency, the Ascending Factorial) that you can use in Excel.
Open the Visual Basic window in Excel. Create a new module in your spreadsheet and paste this code in. Then you can use either "AscendingFactorial" or "GaussianHypergeometricFunction" in the formulas in your spreadsheet.
I don't mean to brag I don't mean to boast But I'm hypergeometric When I eat French toast