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| n | a(n) |
|---|---|
| 10 | 6 |
| 11 | 66 |
| 12 | 792 |
| 13 | 10296 |
| 14 | 144144 |
| 15 | 2162160 |
| 16 | 34594560 |
| 17 | 588107520 |
| 18 | 10585935360 |
| 19 | 201132771840 |
| 20 | 4022655436800 |
| 21 | 84475764172800 |
| 22 | 1858466811801600 |
| 23 | 42744736671436800 |
| 24 | 1025873680114483200 |
| 25 | 25646842002862080000 |
| 26 | 666817892074414080000 |
[6,66,792,10296,144144,2162160,34594560,588107520, 10585935360,201132771840,4022655436800, 84475764172800,1858466811801600,42744736671436800, 1025873680114483200,25646842002862080000, 666817892074414080000] |