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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 24 |
| 4 | 30 |
| 5 | 1440 |
| 6 | 42 |
| 7 | 120960 |
| 8 | 30 |
| 9 | 7257600 |
| 10 | 66 |
| 11 | 958003200 |
| 12 | 2730 |
| 13 | 5230697472000 |
| 14 | 6 |
| 15 | 62768369664000 |
| 16 | 510 |
| 17 | 64023737057280000 |
[1,2,6,24,30,1440,42,120960,30,7257600,66, 958003200,2730,5230697472000,6,62768369664000,510, 64023737057280000] |