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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 12 |
| 3 | 1408 |
| 4 | 1787448 |
| 5 | 19885757988 |
| 6 | 1844551938024312 |
| 7 | 1451215874840625764698 |
| 8 | 9674666289037189459994106966 |
[0,12,1408,1787448,19885757988,1844551938024312, 1451215874840625764698, 9674666289037189459994106966] |