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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 660 |
| 3 | 51240 |
| 4 | 4635540 |
| 5 | 457507512 |
| 6 | 47768769048 |
| 7 | 5188083048720 |
| 8 | 580132098966420 |
| 9 | 66341857216154520 |
| 10 | 7722843117550721160 |
| 11 | 912113857017595941072 |
| 12 | 109025503164832356811800 |
[12,660,51240,4635540,457507512,47768769048, 5188083048720,580132098966420,66341857216154520, 7722843117550721160,912113857017595941072, 109025503164832356811800] |