The number of notes per bar is not really finite given you can make any a:b polyrhythm and you can make any subdivision you like. For example, see the famous falling coin rhythm based on the Fibonacci series in Bartok's "Music for Strings, Percussion and Celeste"[1]
[1] If you want a look at what "Pyramids on Mars"-style musical analysis is like, Erno Lendvai's book about Bartok is pretty awesome. Since Bartok never really wrote or said anything about his compositional methods it's very hard to prove anything conclusively.
[1] If you want a look at what "Pyramids on Mars"-style musical analysis is like, Erno Lendvai's book about Bartok is pretty awesome. Since Bartok never really wrote or said anything about his compositional methods it's very hard to prove anything conclusively.