Square

Front 1

1^2

Back 1

1

Front 2

2^2

Back 2

4

Front 3

3^2

Back 3

9

Front 4

4^2

Back 4

16

Front 5

5^2

Back 5

25

Front 6

6^2

Back 6

36

Front 7

7^2

Back 7

49

Front 8

8^2

Back 8

64

Front 9

9^2

Back 9

81

Front 10

10^2

Back 10

100

Front 11

11^2

Back 11

121

Front 12

12^2

Back 12

144

Front 13

13^2

Back 13

169

Front 14

14^2

Back 14

196

Front 15

15^2

Back 15

225

Front 16

16^2

Back 16

256

Front 17

17^2

Back 17

289

Front 18

18^2

Back 18

324

Front 19

19^2

Back 19

361

Front 20

20^2

Back 20

400