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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 16 |
| 5 | 5 |
| 6 | 576 |
| 7 | 2023 |
| 8 | 4096 |
| 9 | 227529 |
| 10 | 2656000 |
| 11 | 26301011 |
| 12 | 443667456 |
| 13 | 5268921853 |
| 14 | 294332416 |
| 15 | 820814907375 |
| 16 | 19909425135616 |
| 17 | 225992064764177 |
| 18 | 5838869363687424 |
| 19 | 43054524724611979 |
| 20 | 296380418621440000 |
[0,0,0,3,16,5,576,2023,4096,227529,2656000, 26301011,443667456,5268921853,294332416, 820814907375,19909425135616,225992064764177, 5838869363687424,43054524724611979, 296380418621440000] |