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| n | a(n) |
|---|---|
| 1 | 24 |
| 2 | 324 |
| 3 | 7500 |
| 4 | 57624 |
| 5 | 878460 |
| 6 | 2399124 |
| 7 | 12027024 |
| 8 | 23457780 |
| 9 | 73878024 |
| 10 | 297058020 |
| 11 | 443290080 |
| 12 | 1281926124 |
| 13 | 2373639240 |
| 14 | 3158972124 |
| 15 | 5387167824 |
| 16 | 11078235324 |
| 17 | 21084208140 |
| 18 | 25753264260 |
| 19 | 45219115524 |
| 20 | 64037436120 |
| 21 | 75652914024 |
[24,324,7500,57624,878460,2399124,12027024, 23457780,73878024,297058020,443290080,1281926124, 2373639240,3158972124,5387167824,11078235324, 21084208140,25753264260,45219115524,64037436120, 75652914024] |