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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 68 |
| 3 | 34236 |
| 4 | 62758896 |
| 5 | 304863598320 |
| 6 | 3242854167461280 |
| 7 | 66429116436728636640 |
| 8 | 2389384600126093124110080 |
[1,68,34236,62758896,304863598320, 3242854167461280,66429116436728636640, 2389384600126093124110080] |