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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 756756 |
| 4 | 25989269017140 |
| 5 | 9647422924194982967040 |
| 6 | 24935177268489106332174087326700 |
| 7 | 329566582178898535416815000275618647613440 |
[0,1,756756,25989269017140,9647422924194982967040, 24935177268489106332174087326700, 329566582178898535416815000275618647613440] |