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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 72 |
| 3 | 5184 |
| 4 | 640000 |
| 5 | 121500000 |
| 6 | 32934190464 |
| 7 | 12089663946752 |
| 8 | 5777633090469888 |
| 9 | 3486784401000000000 |
| 10 | 2593742460100000000000 |
| 11 | 2331878554708454877954048 |
| 12 | 2492736806448711465154117632 |
| 13 | 3125153805191532199063557103616 |
| 14 | 4541487905530112153400000000000000 |
[0,2,72,5184,640000,121500000,32934190464, 12089663946752,5777633090469888, 3486784401000000000,2593742460100000000000, 2331878554708454877954048, 2492736806448711465154117632, 3125153805191532199063557103616, 4541487905530112153400000000000000] |