x | y |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 6 |
5 | 8 |
6 | 9 |
7 | 10 |
8 | 11 |
9 | 12 |
10 | 13 |
11 | 14 |
12 | 15 |
13 | 16 |