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| n | a(n) |
|---|---|
| 1 | 24 |
| 2 | 864 |
| 3 | 1536 |
| 4 | 8664 |
| 5 | 42336 |
| 6 | 221184 |
| 7 | 1140576 |
| 8 | 5880600 |
| 9 | 30456054 |
| 10 | 157347846 |
| 11 | 813636150 |
| 12 | 4208095734 |
| 13 | 21755077350 |
| 14 | 112508808576 |
| 15 | 581748762966 |
| 16 | 3008229730656 |
| 17 | 15555575422296 |
| 18 | 80436769367064 |
| 19 | 415938351877254 |
[24,864,1536,8664,42336,221184,1140576,5880600, 30456054,157347846,813636150,4208095734, 21755077350,112508808576,581748762966, 3008229730656,15555575422296,80436769367064, 415938351877254] |