| 1 |
| S3 |
| 1 |
| S6 |
| 1 |
| S3n |
|
| 3n(a1+a3n) |
| 2 |
| 3n(2+3n+1) |
| 2 |
| 9n(n+1) |
| 2 |
| 1 |
| S3n |
| 2 |
| 9n(n+1) |
| 2 |
| 9 |
| 1 |
| n |
| 1 |
| n+1 |
| 1 |
| S3 |
| 1 |
| S6 |
| 1 |
| S3n |
| 2 |
| 9 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n |
| 1 |
| n+1 |
| 2n |
| 9(n+1) |
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