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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 39 |
| 5 | 156 |
| 6 | 482 |
| 7 | 1323 |
| 8 | 2983 |
| 9 | 9443 |
| 10 | 39879 |
| 11 | 214747 |
| 12 | 296095 |
| 13 | 296095 |
| 14 | 5541239 |
| 15 | 8621384 |
| 16 | 30789328 |
[0,1,8,39,156,482,1323,2983,9443,39879,214747, 296095,296095,5541239,8621384,30789328] |