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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -115920 |
| 2 | 37534859200 |
| 3 | -30328412970240000 |
| 4 | -482606811957501440000 |
| 5 | -2983637890141033828147200000 |
[1,-115920,37534859200,-30328412970240000, -482606811957501440000, -2983637890141033828147200000] |