As with enchanting, it's 1/25 of market price, where market price is 2,000 gp times the square of the bonus. So it's 80 XP times bonus squared.
Personally, I find that more useful than a chart, because I can keep a formula in my head. But the chart would be as follows:
1 80
2 320
3 720
4 1280
5 2000
6 2880
7 3920
8 5120
9 6480
10 8000
That's assuming hong is correct, which I believe he is.