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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -3 |
| 2 | 49 |
| 3 | -2075 |
| 4 | 168865 |
| 5 | -22606675 |
| 6 | 4522468625 |
| 7 | -1266169501675 |
| 8 | 473063766306625 |
| 9 | -227507081427747875 |
| 10 | 136918092950286480625 |
| 11 | -100805803028947763426875 |
| 12 | 89129323309512937147750625 |
[1,-3,49,-2075,168865,-22606675,4522468625, -1266169501675,473063766306625, -227507081427747875,136918092950286480625, -100805803028947763426875, 89129323309512937147750625] |