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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 216 |
| 3 | 3636 |
| 4 | 152574 |
| 5 | 21331380 |
| 6 | 7767784824 |
| 7 | 7384820647122 |
| 8 | 18209251766239734 |
[7,216,3636,152574,21331380,7767784824, 7384820647122,18209251766239734] |