What's the law of this series of numbers?

The denominator is the square number with 3 as the head, and the numerator is the arithmetic sequence with 7 as the head and 2 as the tolerance

RELATED INFORMATIONS

1. Find the rules: 9 out of 5, 16 out of 12, 25 out of 21, 36 out of 32_____ ,...,____ (expressed by an algebraic expression containing n)
2. First find the rule, and then fill in the numbers 1, 4, 9, □, 25, 36, □, □
3. What are the numbers after 12, 21, 36, 63 and 45 Primary school mathematics
4. 12 21 36 63 45 what's the next number Find the law
5. Find the rule of vacuum, 21 * 24 = 12 * 42, 63 * 12 = 36 * 21, 12 * 84 = 21 * 48. According to these rules, we deduce and list them Which law equation is the law
6. What is the sum of all divisors of 126?
7. How many divisors are there in 126? How many of them are not divisible by 3?
8. How to simplify 0.75 to 3 / 4 and 24 to 1 / 3
9. Simplification - 64 / - 4 and - 24 / - 12
10. How to calculate 64 × 75 + 24 × 65 + 65
11. Observe a group of fractions given, 9 out of 5, 16 out of 12, 25 out of 21, 36 out of 32,... Then the nth fraction can be expressed as
12. A set of data: 9 / 5, 16 / 12, 25 / 21, 36 / 32. What's the seventh number
13. Balmer, a Swiss middle school teacher, found the rule from the spectral data 5 / 9, 12 / 16, 21 / 25, 32 / 36. Please write the seventh number according to the rule
14. Balmer, a Swiss middle school teacher, found the rule from the spectral data 5 / 9, 12 / 16, 21 / 25, 32 / 36. Please write the number n according to the rule
15. Balmer, a Swiss middle school teacher, found the rule from spectral data 5 / 9, 12 / 16, 21 / 25, 32 / 36. Please write the seventh data ()
16. Balmer formula was successfully obtained from spectral data 95161225213632 by Swiss middle school teacher, which opened the door of spectral mystery. Please write the seventh data according to this rule___ ．
17. Find the rule 15,10,13,8,11, (), (), 4
18. Find the Law 15 10 13 9 11 8 () () 7 6
19. Find the rule: (3 / 1 / 4 / 1 = 3 / 4) (9 / 5 / 8 / 5 = 9 / 8) (11 / 7 / 15 / 7 = 11 / 15) (B / A / C / a =?)
20. Find the law 3 ^ 2 = 4 + 5, 5 ^ 2 = 12 + 13, 7 ^ 2 = 24 + 25, find the law, and prove the method