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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 4 |
| 8 | 10 |
| 9 | 45 |
| 10 | 176 |
| 11 | 869 |
| 12 | 4190 |
| 13 | 22684 |
| 14 | 124296 |
| 15 | 845950 |
| 16 | 6444330 |
| 17 | 59042752 |
[1,4,10,45,176,869,4190,22684,124296,845950, 6444330,59042752] |