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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 4 |
| 6 | 23 |
| 7 | 103 |
| 8 | 477 |
| 9 | 2132 |
| 10 | 9647 |
| 11 | 43549 |
| 12 | 197757 |
| 13 | 901162 |
| 14 | 4125636 |
| 15 | 18962997 |
[0,1,4,23,103,477,2132,9647,43549,197757,901162, 4125636,18962997] |