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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3375 |
| 3 | 32768 |
| 4 | 884736 |
| 5 | 884736000 |
| 6 | 147197952000 |
| 7 | 262537412640768000 |
[0,3375,32768,884736,884736000,147197952000, 262537412640768000] |