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| n | a(n) |
|---|---|
| 10 | 18 |
| 11 | 21 |
| 12 | 73 |
| 13 | 279 |
| 14 | 1345 |
| 15 | 6619 |
| 16 | 9050 |
| 17 | 62691 |
| 18 | 91413 |
| 19 | 669562 |
| 20 | 787083 |
[18,21,73,279,1345,6619,9050,62691,91413,669562, 787083] |