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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 24 |
| 4 | 504 |
| 5 | 27720 |
| 6 | 3991680 |
| 7 | 1504863360 |
| 8 | 1485300136320 |
| 9 | 3838015552250880 |
| 10 | 25964175210977203200 |
| 11 | 459851507161617245875200 |
| 12 | 21322394684069868456741273600 |
| 13 | 2588389457883293541569193426124800 |
| 14 | 822618641999347403739646931950148812800 |
[1,3,24,504,27720,3991680,1504863360, 1485300136320,3838015552250880, 25964175210977203200,459851507161617245875200, 21322394684069868456741273600, 2588389457883293541569193426124800, 822618641999347403739646931950148812800] |