Didn't forget. I just included the progressions from the weapon damages he'd listed. In most cases, those weapons are Medium size.
Looking at the pattern and extrapolating, you could do this:
2d4, 2d6, 3d6, 4d6, 6d6, 8d6, 10d6, 13d6, 16d6, 19d6, 23d6, 27d6, 31d6.
1d10, 2d8, 3d8, 4d8, 6d8, 8d8...