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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 48 |
| 4 | 10652 |
| 5 | 2077934208 |
| 6 | 11652660452817664 |
| 7 | 4071032362137611370484875264 |
[0,1,48,10652,2077934208,11652660452817664, 4071032362137611370484875264] |