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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 60750 |
| 3 | 193002701276968128000000 |
| 4 | 5076574217867350877310882935055477754989937924247841796875000000000000 |
[1,2,60750,193002701276968128000000, 50765742178673508773108829350554777549899379242478\ 41796875000000000000] |