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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 720 |
| 7 | 3758757240 |
| 8 | 57952896096182976 |
| 9 | 2018328183128437950016800 |
| 10 | 162526525004284727135887319788800 |
| 11 | 29785621316391113552729016416250323294253 |
[0,0,0,0,0,720,3758757240,57952896096182976, 2018328183128437950016800, 162526525004284727135887319788800, 29785621316391113552729016416250323294253] |