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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 428 |
| 2 | 6068622 |
| 3 | 171548183912 |
| 4 | 6595449547140990 |
| 5 | 302061042944500510428 |
| 6 | 15490059482899736687180550 |
[1,428,6068622,171548183912,6595449547140990, 302061042944500510428,15490059482899736687180550] |