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| n | a(n) |
|---|---|
| 2 | -1 |
| 3 | 5 |
| 4 | -17 |
| 5 | -229 |
| 6 | 853 |
| 7 | 12113 |
| 8 | -46061 |
| 9 | -674761 |
| 10 | 38733269 |
| 11 | -150113729 |
| 12 | 8829861373 |
| 13 | 134484418361 |
| 14 | -525740249453 |
| 15 | -8058251350417 |
| 16 | 486561579496253 |
| 17 | -29557651813108141 |
| 18 | 116325817932650581 |
| 19 | -7111675770821993117 |
| 20 | -110606189396709847609 |
[-1,5,-17,-229,853,12113,-46061,-674761,38733269, -150113729,8829861373,134484418361,-525740249453, -8058251350417,486561579496253,-29557651813108141, 116325817932650581,-7111675770821993117, -110606189396709847609] |