I was bored, so I investigated the EXPTNL.
6 ≤ level ≤ 50:
if level%3 = 0, exptnl(level) = (level^4 + 57*level^2)/9
otherwise, exptnl(level) = (level^4 + 55*level^2 - 56)/9
51 ≤ level:
exptnl(level) = floor(exptnl(level-1)*1.0548)
No clue for 1 ≤ level ≤ 5.
6 ≤ level ≤ 50:
if level%3 = 0, exptnl(level) = (level^4 + 57*level^2)/9
otherwise, exptnl(level) = (level^4 + 55*level^2 - 56)/9
51 ≤ level:
exptnl(level) = floor(exptnl(level-1)*1.0548)
No clue for 1 ≤ level ≤ 5.