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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 24 |
| 3 | 240 |
| 4 | 4320 |
| 5 | 146880 |
| 6 | 9694080 |
| 7 | 1260230400 |
| 8 | 325139443200 |
| 9 | 167121673804800 |
| 10 | 171466837323724800 |
| 11 | 351507016513635840000 |
| 12 | 1440475753672879672320000 |
| 13 | 11803258325595576034990080000 |
| 14 | 193408190923209108909347450880000 |
[1,4,24,240,4320,146880,9694080,1260230400, 325139443200,167121673804800,171466837323724800, 351507016513635840000,1440475753672879672320000, 11803258325595576034990080000, 193408190923209108909347450880000] |