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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 1 |
| 3 | -1 |
| 4 | -1 |
| 5 | 5 |
| 6 | -8 |
| 7 | -1 |
| 8 | 30 |
| 9 | -54 |
| 10 | -5 |
| 11 | 179 |
| 12 | -178 |
| 13 | -608 |
| 14 | 1518 |
| 15 | 2611 |
| 16 | -18198 |
| 17 | 24294 |
| 18 | 73472 |
| 19 | -365936 |
| 20 | 454378 |
| 21 | 1238770 |
| 22 | -6059472 |
| 23 | 7396293 |
| 24 | 18989602 |
| 25 | -90050185 |
| 26 | 97765822 |
| 27 | 309199646 |
| 28 | -1270466588 |
| 29 | 950395782 |
| 30 | 5591065880 |
| 31 | -17812121981 |
| 32 | 3192879156 |
| 33 | 107153213918 |
| 34 | -255721287314 |
| 35 | -142492705829 |
| 36 | 2046576827997 |
| 37 | -3763046892266 |
| 38 | -5107717145521 |
| 39 | 37668440369581 |
| 40 | -55097197661332 |
| 41 | -122428866718927 |
[-1,1,-1,-1,5,-8,-1,30,-54,-5,179,-178,-608,1518, 2611,-18198,24294,73472,-365936,454378,1238770, -6059472,7396293,18989602,-90050185,97765822, 309199646,-1270466588,950395782,5591065880, -17812121981,3192879156,107153213918, -255721287314,-142492705829,2046576827997, -3763046892266,-5107717145521,37668440369581, -55097197661332,-122428866718927] |