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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 72 |
| 10 | 3240 |
| 11 | 118800 |
| 12 | 3920400 |
| 13 | 122316480 |
| 14 | 3710266560 |
| 15 | 111307996800 |
| 16 | 3339239904000 |
| 17 | 100919250432000 |
| 18 | 3088129063219200 |
| 19 | 96012739965542400 |
| 20 | 3040403432242176000 |
| 21 | 98228418580131840000 |
| 22 | 3241537813144350720000 |
[1,72,3240,118800,3920400,122316480,3710266560, 111307996800,3339239904000,100919250432000, 3088129063219200,96012739965542400, 3040403432242176000,98228418580131840000, 3241537813144350720000] |