If we use the "Solution B" encoding,
I've found all the polycubes of n=9
and n=10
that will have collisions:
n=9
: 4 polycubesn=10
: 43 polycubes
I discarded any collisions with arrays of 1s and 0s that don't have fully connected 1s. So the polycube is counted only if it collides with some other valid polycube (or itself in a different orientation: we have 3 such polycubes for n=10).