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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 3 |
| 6 | 12 |
| 7 | 12 |
| 8 | 15 |
| 9 | 75 |
| 10 | 120 |
| 11 | 60 |
| 12 | 105 |
| 13 | 630 |
| 14 | 1350 |
| 15 | 1200 |
| 16 | 360 |
| 17 | 945 |
| 18 | 6615 |
| 19 | 17640 |
| 20 | 22050 |
| 21 | 12600 |
| 22 | 2520 |
[1,1,3,3,12,12,15,75,120,60,105,630,1350,1200,360, 945,6615,17640,22050,12600,2520] |