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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -1 |
| 3 | 9 |
| 4 | -30 |
| 5 | 391 |
| 6 | -2775 |
| 7 | 46172 |
| 8 | -553588 |
| 9 | 11192005 |
| 10 | -191351925 |
| 11 | 4574986218 |
| 12 | -101907446454 |
| 13 | 2833505631927 |
| 14 | -77498068854843 |
| 15 | 2470831451157672 |
| 16 | -79828818251187240 |
| 17 | 2882452216947371577 |
| 18 | -107102178298972458153 |
[0,2,-1,9,-30,391,-2775,46172,-553588,11192005, -191351925,4574986218,-101907446454,2833505631927, -77498068854843,2470831451157672, -79828818251187240,2882452216947371577, -107102178298972458153] |