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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 336 |
| 4 | 64512 |
| 5 | 53329920 |
| 6 | 184308203520 |
| 7 | 2621599886868480 |
| 8 | 152122702768688332800 |
| 9 | 35820150273699719298416640 |
| 10 | 34112245508649716682268134604800 |
| 11 | 131089993748184007771243790830298726400 |
| 12 | 2029650642403883210241235064170615545004032000 |
[1,1,8,336,64512,53329920,184308203520, 2621599886868480,152122702768688332800, 35820150273699719298416640, 34112245508649716682268134604800, 131089993748184007771243790830298726400, 2029650642403883210241235064170615545004032000] |