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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 5240 |
| 3 | 436288 |
| 4 | 33180533 |
| 5 | 2449921734 |
| 6 | 178051989526 |
| 7 | 12835487766480 |
[64,5240,436288,33180533,2449921734,178051989526, 12835487766480] |