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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 20 |
| 3 | 1586 |
| 4 | 315125 |
| 5 | 126303569 |
| 6 | 89413719314 |
| 7 | 102170147565708 |
| 8 | 176499204309919562 |
[1,20,1586,315125,126303569,89413719314, 102170147565708,176499204309919562] |