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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 4 |
| 3 | 6 |
| 4 | 12 |
| 5 | 60 |
| 6 | 2520 |
| 7 | 1286485200 |
| 8 | 35933692027611398678865941374040400000 |
[1,3,4,6,12,60,2520,1286485200, 35933692027611398678865941374040400000] |