The beginning of an Experience table:
(This is not total xp needed for the level, it is XP needed from the last level.)

Barbarian:
  1. 5
  2. 50
  3. 100
  4. 180
  5. 450
  6. 875
  7. 1850
  8. 3850
  9. 5750
  10. 7000


Knight:
  1. 5
  2. 40
  3. 75
  4. 150
  5. 400
  6. 900
  7. 1500
  8. 2750
  9. 5000
  10. 8500


Ranger:
  1. 5
  2. 40
  3. 70
  4. 165
  5. 400
  6. 800
  7. 1500
  8. 3000
  9. 5500
  10. 8500


Thief:
  1. 5
  2. 30
  3. 75
  4. 120
  5. 325
  6. 650
  7. 1000
  8. 2150
  9. 3675
  10. 5000


Cleric:
  1. 5
  2. 25
  3. 50
  4. 200
  5. 400
  6. 750
  7. 1000
  8. 2000
  9. 4000
  10. 7000


Wizard:
  1. 5
  2. 75
  3. 300
  4. 600
  5. 1000
  6. 2000
  7. 4000
  8. 7500
  9. 10000
  10. 15000