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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -14 |
| 3 | -140 |
| 4 | -586 |
| 5 | -5628 |
| 6 | -44492 |
| 7 | -187864 |
| 8 | -482906 |
| 9 | -17262828 |
| 10 | -37958116 |
| 11 | 65242328 |
| 12 | -2453533124 |
| 13 | 21817485480 |
| 14 | 113877127592 |
| 15 | -2570293967536 |
| 16 | 28064994368262 |
| 17 | 169252831757492 |
| 18 | -188223954450804 |
| 19 | 12624245609040632 |
| 20 | 54083158292451540 |
| 21 | -158891267358816264 |
[1,-2,-14,-140,-586,-5628,-44492,-187864,-482906, -17262828,-37958116,65242328,-2453533124, 21817485480,113877127592,-2570293967536, 28064994368262,169252831757492,-188223954450804, 12624245609040632,54083158292451540, -158891267358816264] |