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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 48 |
| 5 | 480 |
| 6 | 0 |
| 7 | 1290240 |
| 8 | 185794560 |
| 9 | 8867730493440 |
| 10 | 1852743352320000 |
[1,0,0,48,480,0,1290240,185794560,8867730493440, 1852743352320000] |