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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 6 |
| 4 | 4 |
| 5 | 6 |
| 6 | 12 |
| 7 | 42 |
| 8 | 16 |
| 9 | 54 |
| 10 | 11 |
| 11 | 55 |
| 12 | 24 |
| 13 | 52 |
| 14 | 84 |
| 15 | 31 |
| 16 | 64 |
| 17 | 272 |
| 18 | 108 |
| 19 | 171 |
| 20 | 21 |
[2,6,4,6,12,42,16,54,11,55,24,52,84,31,64,272,108, 171,21] |