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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 14 |
| 4 | 39 |
| 5 | 294 |
| 6 | 1379 |
| 7 | 8928 |
| 8 | 51388 |
| 9 | 324812 |
| 10 | 2004773 |
| 11 | 12834757 |
| 12 | 82619057 |
| 13 | 542545680 |
| 14 | 3601617244 |
| 15 | 24250827504 |
| 16 | 165252463271 |
[1,14,39,294,1379,8928,51388,324812,2004773, 12834757,82619057,542545680,3601617244, 24250827504,165252463271] |