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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 18 |
| 3 | 165 |
| 4 | 3132 |
| 5 | 137268 |
| 6 | 15548004 |
| 7 | 4679446950 |
| 8 | 3771927027864 |
| 9 | 8186669639820081 |
| 10 | 48184182482857319682 |
| 11 | 774912347548961791914585 |
| 12 | 34299111628183837790980740312 |
| 13 | 4205499936656520106909422649497294 |
[3,18,165,3132,137268,15548004,4679446950, 3771927027864,8186669639820081, 48184182482857319682,774912347548961791914585, 34299111628183837790980740312, 4205499936656520106909422649497294] |