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| n | a(n) |
|---|---|
| 2 | 264 |
| 3 | -480 |
| 4 | 504 |
| 5 | -240 |
| 6 | 82104 |
| 7 | 0 |
| 8 | 103128 |
| 9 | 1024080 |
| 10 | 4203864 |
| 11 | 1863840 |
| 12 | 5672869224 |
| 13 | 15790320 |
| 14 | 81426730488 |
| 15 | 41356037952960 |
| 16 | 185023705021848 |
| 17 | 3639088741200 |
| 18 | 631566517273421638632 |
| 19 | 3701044943799840 |
| 20 | 6265985243914780011624 |
[264,-480,504,-240,82104,0,103128,1024080,4203864, 1863840,5672869224,15790320,81426730488, 41356037952960,185023705021848,3639088741200, 631566517273421638632,3701044943799840, 6265985243914780011624] |