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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 48 |
| 4 | 1536 |
| 5 | 122880 |
| 6 | 23592960 |
| 7 | 10569646080 |
| 8 | 10823317585920 |
| 9 | 24936923717959680 |
| 10 | 127677049435953561600 |
| 11 | 1438154284846580917862400 |
| 12 | 35344079704389572637386342400 |
| 13 | 1882001556099335963795547960115200 |
| 14 | 215842994465920643015783804449692057600 |
[1,1,4,48,1536,122880,23592960,10569646080, 10823317585920,24936923717959680, 127677049435953561600,1438154284846580917862400, 35344079704389572637386342400, 1882001556099335963795547960115200, 215842994465920643015783804449692057600] |