So, yeah my best guess is that it's 3N.
You can also work it out from the wins associated with clans' territories on the map, although they seem to exclude free wins.
Python's territories took 3 (Southeast US), 5 [at least 1 free win] (Gulf Coast), 8 (Eastern Great Lakes), and 12 (Western Great Lakes) wins.
MASTER's territories took 3 (Victoria), 4 (South Australia), 8 (South New Zealand), and 11 (New Southwales) wins.
TSFH's 3 territories took 3 (Southern Mesoamerica), 6 (Colombia), and 8 (South Mexico) wins.
101st is 3/5 [at least 1 free win]/8
Excel is 3/6
VIW is 3/6
TLMS is 3/6
Vikinger is 2 [at least 1 free win]/6
FCC is 3/6
I think the formula is less than 3N. It seems to be 3, 6 for the first two. Third is at least 8. Fourth is at least 12.
EDIT: I'm an idiot. I counted players, not wins, the first time. Fixed the numbers. Seems like they're still wonky because free wins are missing.
Edited 3/18/2021 18:47:28