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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 9 |
| 5 | 8 |
| 6 | 25 |
| 7 | 50 |
| 8 | 88 |
| 9 | 297 |
| 10 | 657 |
| 11 | 1418 |
| 12 | 3212 |
| 13 | 8662 |
| 14 | 24185 |
| 15 | 64103 |
| 16 | 183718 |
[1,1,9,8,25,50,88,297,657,1418,3212,8662,24185, 64103,183718] |