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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 24 |
| 3 | 122522400 |
| 4 | 41936006482988380963200 |
| 5 | 2818633727625754852693848168481445291030176361088000 |
[1,24,122522400,41936006482988380963200, 28186337276257548526938481684814452910301763610880\ 00] |