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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 4 |
| 7 | 10 |
| 8 | 45 |
| 9 | 176 |
| 10 | 869 |
| 11 | 4190 |
| 12 | 22684 |
| 13 | 148480 |
| 14 | 1138974 |
| 15 | 10542605 |
| 16 | 112293430 |
[1,4,10,45,176,869,4190,22684,148480,1138974, 10542605,112293430] |