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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 384 |
| 3 | 46080 |
| 4 | 50692096 |
| 5 | 219414528 |
| 6 | 4413544464384 |
| 7 | 668622959673344 |
[1,8,384,46080,50692096,219414528,4413544464384, 668622959673344] |