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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 352 |
| 5 | 91520 |
| 6 | 142405120 |
| 7 | 1328924579840 |
| 8 | 74403829376081920 |
| 9 | 24994031979330942894080 |
| 10 | 50376471215620688640734003200 |
| 11 | 609214555257707874214915513922355200 |
| 12 | 44204249911340791820804231319883906967142400 |
[1,1,8,352,91520,142405120,1328924579840, 74403829376081920,24994031979330942894080, 50376471215620688640734003200, 609214555257707874214915513922355200, 44204249911340791820804231319883906967142400] |