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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 139 |
| 4 | 7813 |
| 5 | 1282741 |
| 6 | 626077507 |
| 7 | 914089078999 |
| 8 | 4000061058178633 |
| 9 | 52496811551448519241 |
| 10 | 2066694521388276020211487 |
| 11 | 244076623554395367965602542499 |
| 12 | 86475371441574361841467969073397133 |
| 13 | 91913288701991663661449175594278601481981 |
[1,1,7,139,7813,1282741,626077507,914089078999, 4000061058178633,52496811551448519241, 2066694521388276020211487, 244076623554395367965602542499, 86475371441574361841467969073397133, 91913288701991663661449175594278601481981] |