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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | 280 |
| 4 | 11536 |
| 5 | 703296 |
| 6 | 59653440 |
| 7 | 6715007104 |
| 8 | 967972497664 |
| 9 | 173764741920768 |
| 10 | 37986612815698944 |
| 11 | 9929613975171315712 |
| 12 | 3056815269626584895488 |
| 13 | 1094148286150918628229120 |
[1,0,12,280,11536,703296,59653440,6715007104, 967972497664,173764741920768,37986612815698944, 9929613975171315712,3056815269626584895488, 1094148286150918628229120] |