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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 1125 |
| 4 | 63504 |
| 5 | 2080800 |
| 6 | 92160000 |
| 7 | 4045204800 |
| 8 | 171889843216 |
| 9 | 7330747451944 |
| 10 | 316825404168100 |
| 11 | 13575541351218337 |
| 12 | 583084349120160000 |
| 13 | 25065468339217054272 |
| 14 | 1077387582576682598400 |
| 15 | 46295580843818152835625 |
[1,16,1125,63504,2080800,92160000,4045204800, 171889843216,7330747451944,316825404168100, 13575541351218337,583084349120160000, 25065468339217054272,1077387582576682598400, 46295580843818152835625] |