Which means you get 9, 11, and 13 hp respectively for every two class levels after first, and 4, 5, and 6 hp for the remaining hit die.
Put another way, total HP for 10th level characters looks like this:
Hit die: total HP
d4: 26 + (10x Con mod)
d6: 37 + (10x Con mod)
d8: 48 + (10x Con mod)
d10: 59 + (10x Con mod)
d12: 70 + (10x Con mod)