Maximum level different when get EXP/SP in monsters is 13 level
Retail formula fur cute is: Math.min(300. / (Math.pow(Math.max(Math.pow(іdx, 3), 1.), 1.12) + 270.), 1.)
[EXP TABLE]
0 .. 2: 1.0 (100%) 3: ~0.969 (96.9%) 4: ~0.802 (80.2%) 5: ~0.608 (60.8%) 6: ~0.438 (43.8%) 7: ~0.310 (31.0%) 8: ~0.219 (21.9%) 9: ~0.157 (15.7%) 10: ~0.114 (11.4%) 11: ~0.085 (8.5%) 12: ~0.065 (6.5%) 13: ~0.050 (5.0%) > 13: 0.0 (0%)