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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 362880 |
| 2 | 12504636144000 |
| 3 | 1080491954750208000000 |
| 4 | 140810154080474667338550000000 |
| 5 | 23183587808948692737291767860055162880 |
| 6 | 4439413043841128802009762476941510771390464000 |
[1,362880,12504636144000,1080491954750208000000, 140810154080474667338550000000, 23183587808948692737291767860055162880, 4439413043841128802009762476941510771390464000] |