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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | -15 |
| 3 | 945 |
| 4 | -44415 |
| 5 | 5769225 |
| 6 | -711485775 |
| 7 | 171504558225 |
| 8 | -40549611477375 |
| 9 | 15553976334521625 |
| 10 | -6025672551378855375 |
| 11 | 3368007502842396038625 |
| 12 | -1937899053877871819109375 |
| 13 | 1488068350680083972290115625 |
[0,3,-15,945,-44415,5769225,-711485775, 171504558225,-40549611477375,15553976334521625, -6025672551378855375,3368007502842396038625, -1937899053877871819109375, 1488068350680083972290115625] |