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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 13 |
| 4 | 27 |
| 5 | 250 |
| 6 | 1027 |
| 7 | 7325 |
| 8 | 41828 |
| 9 | 286471 |
| 10 | 1880024 |
| 11 | 13073044 |
| 12 | 90717167 |
| 13 | 642317301 |
| 14 | 4569527100 |
| 15 | 32812863245 |
| 16 | 236942593847 |
[1,13,27,250,1027,7325,41828,286471,1880024, 13073044,90717167,642317301,4569527100, 32812863245,236942593847] |