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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 10 |
| 4 | 3360 |
| 5 | 1829520 |
| 6 | 2010023400 |
| 7 | 3622767548400 |
| 8 | 9820308795897600 |
| 9 | 38117776055769009600 |
| 10 | 204209112522362230483200 |
| 11 | 1465227517158776390187168000 |
| 12 | 13730711637579303579659695248000 |
[1,0,0,10,3360,1829520,2010023400,3622767548400, 9820308795897600,38117776055769009600, 204209112522362230483200, 1465227517158776390187168000, 13730711637579303579659695248000] |