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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 84 |
| 4 | 3456 |
| 5 | 219120 |
| 6 | 19281600 |
| 7 | 2324085120 |
| 8 | 370554347520 |
| 9 | 74897768655360 |
| 10 | 18761274367718400 |
| 11 | 5708008284647961600 |
| 12 | 2072453585852572876800 |
| 13 | 885341762559654194995200 |
| 14 | 439630143301970662603161600 |
| 15 | 251099117378080818090596352000 |
| 16 | 163464570058143774978660630528000 |
[0,8,84,3456,219120,19281600,2324085120, 370554347520,74897768655360,18761274367718400, 5708008284647961600,2072453585852572876800, 885341762559654194995200, 439630143301970662603161600, 251099117378080818090596352000, 163464570058143774978660630528000] |