a lot of teams. In fact, about 100!
There are 346 mens basketball teams in the NCAA Division I.
just take the number of teams in NCAA and times that by 13
From 1939-1950 eight teams played, in 1952 it was doubled to sixteen
Click the link:
How many mens ncaa tournaments have there been
North Carolina Kansas UCLA Memphis
68, with 4 play-in games
only one ,CONN. in 2004