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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 1 |
| 3 | 2 |
| 4 | -1 |
| 5 | 10 |
| 6 | -43 |
| 7 | 266 |
| 8 | -1853 |
| 9 | 14834 |
| 10 | -133495 |
| 11 | 1334962 |
| 12 | -14684569 |
| 13 | 176214842 |
| 14 | -2290792931 |
| 15 | 32071101050 |
| 16 | -481066515733 |
| 17 | 7697064251746 |
| 18 | -130850092279663 |
| 19 | 2355301661033954 |
| 20 | -44750731559645105 |
| 21 | 895014631192902122 |
| 22 | -18795307255050944539 |
[2,1,2,-1,10,-43,266,-1853,14834,-133495,1334962, -14684569,176214842,-2290792931,32071101050, -481066515733,7697064251746,-130850092279663, 2355301661033954,-44750731559645105, 895014631192902122,-18795307255050944539] |