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| n | a(n) |
|---|---|
| 2 | -1 |
| 3 | -1 |
| 4 | 100 |
| 5 | 1425 |
| 6 | -1 |
| 7 | 389305 |
| 8 | 8946176 |
| 9 | 225331713 |
| 10 | 6210001000 |
| 11 | 186492227801 |
| 12 | 6073061476032 |
| 13 | 213404945384449 |
| 14 | 8054585122464440 |
| 15 | 325144322753909625 |
| 16 | 13983676842985394176 |
[-1,-1,100,1425,-1,389305,8946176,225331713, 6210001000,186492227801,6073061476032, 213404945384449,8054585122464440, 325144322753909625,13983676842985394176] |