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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 891 |
| 9 | 18042 |
| 10 | 337134 |
| 11 | 6078371 |
| 12 | 108359977 |
| 13 | 1938212839 |
| 14 | 35109518705 |
| 15 | 648102812344 |
[1,37,891,18042,337134,6078371,108359977, 1938212839,35109518705,648102812344] |