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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 8 |
| 3 | 1152 |
| 4 | 1605632 |
| 5 | 43913893117952 |
| 6 | 98583626709555431615548620800 |
| 7 | 197241992148713072661201501950348880945923403897735704916000768 |
[2,8,1152,1605632,43913893117952, 98583626709555431615548620800, 19724199214871307266120150195034888094592340389773\ 5704916000768] |