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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 48 |
| 3 | 1567641600 |
| 4 | 9698137182219213471744000000 |
| 5 | 21488900044302744250061179567064173417691432878080000000000000000 |
[1,1,48,1567641600,9698137182219213471744000000, 21488900044302744250061179567064173417691432878080\ 000000000000000] |