| 1 |
| 3 |
| 2 |
| 4 |
| 3 |
| 15 |
| 4 |
| 24 |
| 5 |
| 35 |
| 6 |
| 44 |
| 2 |
| 63 |
| 2 |
| 63 |
| 1 |
| 1-a |
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
如图所示,是一个自然数排列的三角形数阵:根据该数阵的规律,第6行第3个数是| n2-n+4 |
| 2 |
| n2-n+4 |
| 2 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 56 |
| 1 |
| n(n+1) |
| 1 |
| n(n+1) |
| 1 |
| 2 |
| 3 |
| 10 |
| 5 |
| 26 |
| 7 |
| 50 |
| 15 |
| 226 |
| 15 |
| 226 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 10 |
| 1 |
| 15 |
| 1 |
| 26 |
| 1 |
| 35 |
| 1 |
| 122 |
| 1 |
| 122 |
| 9 |
| 5 |
| 16 |
| 12 |
| 25 |
| 21 |
| 36 |
| 32 |
| 100 |
| 96 |
| 100 |
| 96 |
| 1 |
| 2 |
| 2 |
| 5 |
| 3 |
| 10 |
| 4 |
| 17 |
| 5 |
| 26 |
| 6 |
| 37 |
| n |
| n2-1 |
| n |
| n2-1 |
| 1 |
| 2 |
| 7 |
| 4 |
| 31 |
| 6 |
| 63 |
| 7 |
| 63 |
| 7 |