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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 12 |
| 5 | 360 |
| 6 | 86400 |
| 7 | 269568000 |
| 8 | 17662095360000 |
| 9 | 39345496591564800000 |
| 10 | 4820704671590339051520000000 |
| 11 | 52567343238846954009129910272000000000 |
| 12 | 82543717140049422917575408530662149324800000000000 |
[1,1,1,2,12,360,86400,269568000,17662095360000, 39345496591564800000,4820704671590339051520000000, 52567343238846954009129910272000000000, 82543717140049422917575408530662149324800000000000\ ] |