The HF-based MBE(n) interaction energies converge as expected to the reference supersystem value, with five-body terms that are negligible in what is effectively the basis-set limit, aQZ. Higher-order n-body terms can sometimes be artifacts of basis-set superposition error (BSSE), which likely explains the diminished importance of the six-body terms at the HF/aTZ and HF/aQZ levels, relative to HF/aDZ results.