According to 9 out of 5, 16 out of 12, 25 out of 21, 36 out of 32, what is the nth one, which is denoted by letter N (≥ 1)

(n+2)^2/

1,7 out of 9 = 9 + () 21 out of 10 + () 36 out of 29 = 12 out of 2. For a fraction, 2 is used twice, 3 is used once, and 5 is used once
If the final score is 3 / 4, the original score is ()

1,7 / 9 = (9 + 18) 21 / 9
36 out of (10 + 77) = 12 out of 29
4×2×2×3×5=240
3×2×2×3×5=180
So it's 180 out of 240