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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5040 |
| 2 | 3432645216000 |
| 3 | 626489905645044080640000000 |
| 4 | 41646279370357699257014919153469440000000000000 |
| 5 | 1200992054275801322636044235924808416678612164215512865177600000000000000 |
[1,5040,3432645216000,626489905645044080640000000, 41646279370357699257014919153469440000000000000, 12009920542758013226360442359248084166786121642155\ 12865177600000000000000] |