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Well, you should be able to approximate it by
1 - ((1 - (0.2 * points in talent))^5)
or:
Points in talent: chance to reapply within 5 casts
0: 0
1: 0.67232 = 1 - (0.8^5)
2: 0.92224 = 1 - (0.6^5)
3: 0.98976 = 1 - (0.4^5)
4: 0.99968 = 1 - (0.2^5)
5: 1
Examine the line for one talent point "1: 0.67232 = 1 - (0.8^5)"
With one talent point, you have a 20% or 0.2 chance to apply with each successful cast. You have 5 casts with which to apply the debuff. You have an 80% or 0.8 chance to fail each time. Your odds of failing 5 consecutive independent trials is 0.8^5. Thus, your odds of succeeding are "1 - (odds to fail)", or "1 - (0.8^5)".
Someone please correct me if I'm wrong!
EDIT: Hmm, I just realized that I'm simplifying things a bit too much, probably. I'm not taking into account the fact that your "five-casts" window of opportunity is reset with each successful application.
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