@Bunni
I'm not sure of the musical value of the exercise, but in these times of lockdown there is time for messing about with all sorts of things one would not normally entertain, so...
Within a 1/4 beat there are 6 x 1/16T, each of which can be a note or a rest. That's (2^6 =) 64 possible combinations of 16T notes and rests within a single crotchet beat. See attached. Each beat on page 1 contains one of the 64 possible combinations of 1/16T notes and rests. Page 2 is the same pattern but with rests within a beat merged to make longer notes. So that's another 64 combinations. If any one beat in a measure of 4/4 can use any of these that's 512 possible combinations, and that's without ties across beats and bar lines...
Have fun...