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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 8 |
| 3 | 60 |
| 4 | 180 |
| 5 | 1680 |
| 6 | 8064 |
| 7 | 90720 |
| 8 | 604800 |
| 9 | 7983360 |
| 10 | 68428800 |
| 11 | 1037836800 |
| 12 | 10897286400 |
| 13 | 186810624000 |
| 14 | 2324754432000 |
| 15 | 44460928512000 |
| 16 | 640237370572800 |
| 17 | 13516122267648000 |
| 18 | 221172909834240000 |
| 19 | 5109094217170944000 |
| 20 | 93666727314800640000 |
| 21 | 2350183339898634240000 |
| 22 | 47726800133326110720000 |
[1,6,8,60,180,1680,8064,90720,604800,7983360, 68428800,1037836800,10897286400,186810624000, 2324754432000,44460928512000,640237370572800, 13516122267648000,221172909834240000, 5109094217170944000,93666727314800640000, 2350183339898634240000,47726800133326110720000] |