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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 216 |
| 3 | 612144 |
| 4 | 441216255168 |
| 5 | 861552612144196275828096 |
| 6 | 690828572691441216255168570323026341485702575488 |
[12,216,612144,441216255168, 861552612144196275828096, 690828572691441216255168570323026341485702575488] |