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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 80 |
| 3 | 53760 |
| 4 | 590413824 |
| 5 | 104981650735104 |
| 6 | 300931721514121691136 |
| 7 | 13874404129378738693891686400 |
| 8 | 10274196157891080769280680484929536000 |
| 9 | 122089077024940067215877965611538507917950976000 |
| 10 | 23266604385482749027479729551862778584550130343015874560000 |
[1,2,80,53760,590413824,104981650735104, 300931721514121691136, 13874404129378738693891686400, 10274196157891080769280680484929536000, 122089077024940067215877965611538507917950976000, 23266604385482749027479729551862778584550130343015\ 874560000] |