You could put a workbook on dropbox or box.net and post a link.

Using the coefficients from a trendline formula on a graph is a bad idea -- there is insufficient precision shown by default, and if you fix that by formatting, it is an error-prone, manual mess to copy the coefficients.

The alternative is to use LINEST to get the coefficients on the worksheet, which is easy, but forecasting with a polynomial is a bad idea -- they will fit anything, but the fit doesn't have much meaning. A linear (constant change YoY) or exponential (constant mutiple YoY) trendline makes more sense. You can also get those coefficients with LINEST.