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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7200 |
| 3 | 474211584000 |
| 4 | 1981999450972492922880000 |
| 5 | 1401219961854040654113268364083200000000000 |
| 6 | 370389015130516478011776928922387124162707119541939129548800000000 |
[1,2,7200,474211584000,1981999450972492922880000, 1401219961854040654113268364083200000000000, 37038901513051647801177692892238712416270711954193\ 9129548800000000] |