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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 129 |
| 5 | 1436 |
| 6 | 20853 |
| 7 | 379716 |
| 8 | 8421969 |
| 9 | 222507532 |
| 10 | 6879755613 |
| 11 | 245389976756 |
| 12 | 9977456650329 |
| 13 | 457823345757948 |
| 14 | 23505009169553733 |
| 15 | 1340233911805244836 |
| 16 | 84321693844646338209 |
| 17 | 5820386696023034821484 |
[1,1,3,16,129,1436,20853,379716,8421969,222507532, 6879755613,245389976756,9977456650329, 457823345757948,23505009169553733, 1340233911805244836,84321693844646338209, 5820386696023034821484] |