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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 3024000 |
| 3 | 858574080000 |
| 4 | 1226178516326400000 |
| 5 | 5912338932461445120000000 |
| 6 | 75732595735526211882516480000000 |
| 7 | 2195068320271703663798288449536000000000 |
| 8 | 128322069958974226301129597680106864640000000000 |
[1,120,3024000,858574080000,1226178516326400000, 5912338932461445120000000, 75732595735526211882516480000000, 2195068320271703663798288449536000000000, 128322069958974226301129597680106864640000000000] |