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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 25 |
| 4 | 1461 |
| 5 | 350649 |
| 6 | 329985827 |
| 7 | 1158266740087 |
| 8 | 15396080290130290 |
| 9 | 772462850808202305809 |
| 10 | 146439171275776627088638614 |
| 11 | 104845555459822852114388229089230 |
[0,2,25,1461,350649,329985827,1158266740087, 15396080290130290,772462850808202305809, 146439171275776627088638614, 104845555459822852114388229089230] |