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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 162 |
| 4 | 30720 |
| 5 | 562500 |
| 6 | 1693052928 |
| 7 | 5534208960 |
| 8 | 414571718246400 |
| 9 | 87954833872105200 |
| 10 | 121080960000000000000 |
| 11 | 34545810976783666560 |
| 12 | 1757453597218363858432819200 |
| 13 | 20403194639791728130329600 |
[1,8,162,30720,562500,1693052928,5534208960, 414571718246400,87954833872105200, 121080960000000000000,34545810976783666560, 1757453597218363858432819200, 20403194639791728130329600] |