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| n | a(n) |
|---|---|
| 7 | 0 |
| 8 | 70 |
| 9 | 8820 |
| 10 | 320292 |
| 11 | 7850304 |
| 12 | 156301992 |
| 13 | 2749114368 |
| 14 | 44604811680 |
| 15 | 685421399520 |
[0,70,8820,320292,7850304,156301992,2749114368, 44604811680,685421399520] |