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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | -10 |
| 4 | -2872 |
| 5 | 83818 |
| 6 | 10194380 |
| 7 | 1201034718 |
| 8 | -434124645744 |
| 9 | -21017961579822 |
| 10 | 3112138256976532 |
| 11 | 12699119070248719814 |
| 12 | -2651876213664722621096 |
| 13 | -900449010135889648937414 |
[0,2,4,-10,-2872,83818,10194380,1201034718, -434124645744,-21017961579822,3112138256976532, 12699119070248719814,-2651876213664722621096, -900449010135889648937414] |