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All stats go from 3 to 18... except strength, strength is normal from 3- 17, but at 18 it gets a /##.
what do those extra number mean and how are they generated?
This question / problem has been solved by xdiespimage
[url=http://playithardcore.com/pihwiki/index.php?title=Icewind_Dale:_Races_and_Stats#Strength]http://playithardcore.com/pihwiki/index.php?title=Icewind_Dale:_Races_and_Stats#Strength[/url]

From 18 to 19 strenght there's a world of increasing bonuses:

18 +1
18/01-50 +1
18/51-75 +2
18/76-90 +2
18/91-99 +2
18/00 +3

(check the page for the thac0 increase and more)
Post edited November 08, 2010 by xdiesp
Note the increase in damage adjustment at those various levels as well.
thank you, wish I could mark both posts as the answer because Coelocanth adds important bit of info. Specifically, that there is a little more to them than just the info you posted, but all of it is explained in full in the link you posted, thank you both.
Nah, xdiesp provided a link with all the info, so he deserves the solution award. I just wanted to make sure you didn't overlook the damage bonuses as well.