r squared critical values

What are the critical values for 95% and 90% confidence levels for r squared
for all whole numbers from 10 to 50? The table I have now is for 95% and
incomplete:

10 0.4
14 0.27
20 0.2
25 0.16
30 0.13
50 0.08

I will be using this for stock market prices, I don't know if I need
one-tailed or two-tailed values.
Thank you in advance for your help, markable