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| n | a(n) |
|---|---|
| 4 | 8 |
| 5 | 18 |
| 6 | 107798 |
| 7 | 6685156 |
| 8 | 62777794 |
| 9 | 313834602 |
| 10 | 1129602808 |
| 11 | 3313914698 |
| 12 | 8438118356 |
| 13 | 19340801916 |
[8,18,107798,6685156,62777794,313834602, 1129602808,3313914698,8438118356,19340801916] |