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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 280 |
| 5 | 70560 |
| 6 | 19958400 |
| 7 | 6659452800 |
| 8 | 2644408166400 |
| 9 | 1244905998336000 |
| 10 | 689322235650048000 |
| 11 | 444916954745303040000 |
| 12 | 331767548149023866880000 |
| 13 | 283424276847308960563200000 |
| 14 | 275246422218908346286080000000 |
[1,280,70560,19958400,6659452800,2644408166400, 1244905998336000,689322235650048000, 444916954745303040000,331767548149023866880000, 283424276847308960563200000, 275246422218908346286080000000] |