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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 36 |
| 4 | 984 |
| 5 | 43800 |
| 6 | 2868480 |
| 7 | 259554960 |
| 8 | 31012490880 |
| 9 | 4728875800320 |
| 10 | 896042510496000 |
| 11 | 206523228759724800 |
| 12 | 56893926736333209600 |
| 13 | 18461230471787348044800 |
| 14 | 6968851610446509386803200 |
[1,2,36,984,43800,2868480,259554960,31012490880, 4728875800320,896042510496000,206523228759724800, 56893926736333209600,18461230471787348044800, 6968851610446509386803200] |