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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 144 |
| 7 | 108 |
| 8 | 108 |
| 9 | 144 |
| 10 | 240 |
| 11 | 384 |
| 12 | 616 |
| 13 | 960 |
| 14 | 1376 |
| 15 | 2048 |
| 16 | 3008 |
| 17 | 4488 |
| 18 | 6816 |
| 19 | 10184 |
| 20 | 15344 |
| 21 | 23016 |
[1,2,6,24,120,144,108,108,144,240,384,616,960, 1376,2048,3008,4488,6816,10184,15344,23016] |