| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 24 |
| 6 | 60 |
| 7 | 720 |
| 8 | 42 |
| 9 | 8064 |
| 10 | 60480 |
| 11 | 3628800 |
| 12 | 2851200 |
| 13 | 95800320 |
| 14 | 1556755200 |
| 15 | 29059430400 |
| 16 | 653837184000 |
| 17 | 20922789888000 |
| 18 | 59281238016000 |
| 19 | 6402373705728000 |
| 20 | 3379030566912000 |
| 21 | 62382102773760000 |
| 22 | 91233825306624000 |
[1,1,2,3,24,60,720,42,8064,60480,3628800,2851200, 95800320,1556755200,29059430400,653837184000, 20922789888000,59281238016000,6402373705728000, 3379030566912000,62382102773760000, 91233825306624000] |