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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | 19440 |
| 4 | 4293918720 |
| 5 | 298022460937500000 |
| 6 | 10314424627908807366593740800 |
| 7 | 256923577502496762167593902921782457650400 |
| 8 | 6277101735385253516143083463326608130132905949327651766272 |
| 9 | 196627050475552807506414708879663572595247698231546775823411085055396409324160 |
[1,0,12,19440,4293918720,298022460937500000, 10314424627908807366593740800, 256923577502496762167593902921782457650400, 62771017353852535161430834633266081301329059493276\ 51766272, 19662705047555280750641470887966357259524769823154\ 6775823411085055396409324160] |