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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 8 |
| 4 | 320 |
| 5 | 288 |
| 6 | 1920 |
| 7 | 17280 |
| 8 | 5806080 |
| 9 | 89600 |
| 10 | 87091200 |
| 11 | 17418240 |
| 12 | 1494484992000 |
| 13 | 402361344000 |
| 14 | 62768369664000 |
| 15 | 295206912 |
| 16 | 4097519171665920 |
| 17 | 342372925440000 |
| 18 | 256094948229120000 |
| 19 | 5377993912811520000 |
| 20 | 5573557327822848000000 |
| 21 | 89903156428800000 |
| 22 | 32371220959995101184000 |
| 23 | 73570956727261593600000 |
[1,2,8,8,320,288,1920,17280,5806080,89600, 87091200,17418240,1494484992000,402361344000, 62768369664000,295206912,4097519171665920, 342372925440000,256094948229120000, 5377993912811520000,5573557327822848000000, 89903156428800000,32371220959995101184000, 73570956727261593600000] |