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| n | a(n) |
|---|---|
| 4 | 6 |
| 5 | 0 |
| 6 | 616 |
| 7 | 635 |
| 8 | 78688 |
| 9 | 149480 |
| 10 | 17605696 |
| 11 | 69492920 |
| 12 | 8671131376 |
| 13 | 72256187200 |
| 14 | 10754086795840 |
| 15 | 162770370597240 |
| 16 | 31157969676392800 |
| 17 | 681286019507189376 |
[6,0,616,635,78688,149480,17605696,69492920, 8671131376,72256187200,10754086795840, 162770370597240,31157969676392800, 681286019507189376] |