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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 37 |
| 5 | 185 |
| 6 | 1115 |
| 7 | 7806 |
| 8 | 62448 |
| 9 | 562039 |
| 10 | 5620395 |
| 11 | 61824349 |
| 12 | 741892191 |
| 13 | 9644598485 |
| 14 | 135024378793 |
| 15 | 2025365681905 |
| 16 | 32405850910490 |
| 17 | 550899465478334 |
| 18 | 9916190378610019 |
| 19 | 188407617193590372 |
| 20 | 3768152343871807455 |
[1,3,9,37,185,1115,7806,62448,562039,5620395, 61824349,741892191,9644598485,135024378793, 2025365681905,32405850910490,550899465478334, 9916190378610019,188407617193590372, 3768152343871807455] |