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| n | a(n) |
|---|---|
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 18 |
| 7 | 46 |
| 8 | 100 |
| 9 | 204 |
| 10 | 420 |
| 11 | 840 |
| 12 | 1708 |
| 13 | 3478 |
| 14 | 7066 |
| 15 | 14286 |
| 16 | 28772 |
[2,4,10,18,46,100,204,420,840,1708,3478,7066, 14286,28772] |