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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 5 |
| 4 | 33 |
| 5 | 204 |
| 6 | 1197 |
| 7 | 6819 |
| 8 | 42159 |
| 9 | 275121 |
| 10 | 1815549 |
| 11 | 12016439 |
| 12 | 80736799 |
| 13 | 549817646 |
| 14 | 3782109653 |
| 15 | 26255442285 |
| 16 | 183807464161 |
[2,5,33,204,1197,6819,42159,275121,1815549, 12016439,80736799,549817646,3782109653, 26255442285,183807464161] |