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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 48648960 |
| 3 | 8690922240480 |
| 4 | 2374127830286012160 |
| 5 | 823940558733748910598720 |
| 6 | 333504309246734399617946903040 |
| 7 | 150277870737901828652705825755721760 |
| 8 | 73288704867601350013562616043249358012160 |
| 9 | 37980016035292737119901943600678905519608160480 |
[1,720,48648960,8690922240480,2374127830286012160, 823940558733748910598720, 333504309246734399617946903040, 150277870737901828652705825755721760, 73288704867601350013562616043249358012160, 37980016035292737119901943600678905519608160480] |