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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 24 |
| 2 | 13824 |
| 3 | 7962600 |
| 4 | 4586443776 |
| 5 | 2641783652376 |
| 6 | 1521662797324800 |
| 7 | 876475129475432424 |
| 8 | 504848152915051751424 |
| 9 | 290791659603940333387800 |
| 10 | 167495491083716716979621376 |
| 11 | 96477112072561225039928524776 |
| 12 | 55570649058304181906281850649600 |
[0,24,13824,7962600,4586443776,2641783652376, 1521662797324800,876475129475432424, 504848152915051751424,290791659603940333387800, 167495491083716716979621376, 96477112072561225039928524776, 55570649058304181906281850649600] |