| 9 |
| 5 |
| (1+2)2 |
| 1×(1+4) |
| 16 |
| 12 |
| (2+2)2 |
| 2×(2+4) |
| 25 |
| 21 |
| (3+2)2 |
| 3×(3+4) |
| 36 |
| 32 |
| (4+2)2 |
| 4×(4+4) |
∴第n个数为:
| (n+2)2 |
| n(n+4) |
故答案为:
| (n+2)2 |
| n(n+4) |
| 9 |
| 5 |
| 16 |
| 12 |
| 25 |
| 21 |
| 36 |
| 32 |
| 9 |
| 5 |
| (1+2)2 |
| 1×(1+4) |
| 16 |
| 12 |
| (2+2)2 |
| 2×(2+4) |
| 25 |
| 21 |
| (3+2)2 |
| 3×(3+4) |
| 36 |
| 32 |
| (4+2)2 |
| 4×(4+4) |
| (n+2)2 |
| n(n+4) |
| (n+2)2 |
| n(n+4) |