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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 12 |
| 3 | 34560 |
| 4 | 125411328000 |
| 5 | 265790267296391946810949632000000000 |
| 6 | 792786697595796795607377086400871488552960000000000000 |
[2,12,34560,125411328000, 265790267296391946810949632000000000, 79278669759579679560737708640087148855296000000000\ 0000] |