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A057091 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 72 |
| 3 | 640 |
| 4 | 5696 |
| 5 | 50688 |
| 6 | 451072 |
| 7 | 4014080 |
| 8 | 35721216 |
| 9 | 317882368 |
| 10 | 2828828672 |
| 11 | 25173688320 |
| 12 | 224020135936 |
| 13 | 1993550594048 |
| 14 | 17740565839872 |
| 15 | 157872931471360 |
| 16 | 1404907978489856 |
| 17 | 12502247279689728 |
| 18 | 111257242065436672 |
| 19 | 990075914761011200 |
| 20 | 8810665254611582976 |
[1,8,72,640,5696,50688,451072,4014080,35721216, 317882368,2828828672,25173688320,224020135936, 1993550594048,17740565839872,157872931471360, 1404907978489856,12502247279689728, 111257242065436672,990075914761011200, 8810665254611582976] |