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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 70 |
| 3 | 34650 |
| 4 | 63063000 |
| 5 | 304028985024 |
| 6 | 3200982922029530 |
| 7 | 64736431797158097635 |
[1,1,70,34650,63063000,304028985024, 3200982922029530,64736431797158097635] |