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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 10 |
| 6 | 6 |
| 7 | 42 |
| 8 | 16 |
| 9 | 9 |
| 10 | 20 |
| 11 | 110 |
| 12 | 24 |
| 13 | 156 |
| 14 | 84 |
| 15 | 30 |
| 16 | 64 |
| 17 | 136 |
| 18 | 18 |
| 19 | 20 |
| 20 | 40 |
[2,3,8,10,6,42,16,9,20,110,24,156,84,30,64,136,18, 20,40] |