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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 31 |
| 5 | 103 |
| 6 | 401 |
| 7 | 1537 |
| 8 | 6157 |
| 9 | 24748 |
| 10 | 101291 |
| 11 | 417374 |
| 12 | 1735847 |
| 13 | 7261892 |
| 14 | 30561122 |
| 15 | 129215115 |
[1,3,8,31,103,401,1537,6157,24748,101291,417374, 1735847,7261892,30561122,129215115] |