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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 2520 |
| 3 | 7380816 |
| 4 | 178971208720 |
| 5 | 35812807522735456 |
| 6 | 59168572189285825092176 |
| 7 | 807064033391096001306908915584 |
| 8 | 90885346773699848753942253937462269824 |
[7,2520,7380816,178971208720,35812807522735456, 59168572189285825092176, 807064033391096001306908915584, 90885346773699848753942253937462269824] |