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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 36 |
| 4 | 1260 |
| 5 | 7452 |
| 6 | 25092 |
| 7 | 63360 |
| 8 | 134136 |
| 9 | 252000 |
| 10 | 434232 |
| 11 | 700812 |
| 12 | 1074420 |
[0,36,1260,7452,25092,63360,134136,252000,434232, 700812,1074420] |