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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 288 |
| 3 | 53094139822080000 |
| 4 | 7114507432973653690572666462301501337370624000000000000 |
[1,1,288,53094139822080000, 71145074329736536905726664623015013373706240000000\ 00000] |