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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 8 |
| 4 | 49 |
| 5 | 259 |
| 6 | 1478 |
| 7 | 7448 |
| 8 | 38788 |
| 9 | 219569 |
| 10 | 1333733 |
| 11 | 8486181 |
| 12 | 55791794 |
| 13 | 375324308 |
| 14 | 2564288273 |
| 15 | 17682410960 |
| 16 | 122670267805 |
[3,8,49,259,1478,7448,38788,219569,1333733, 8486181,55791794,375324308,2564288273,17682410960, 122670267805] |