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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -1 |
| 3 | -5 |
| 4 | 65 |
| 5 | 2665 |
| 6 | -322465 |
| 7 | -117699725 |
| 8 | 128645799425 |
| 9 | 422086867913425 |
| 10 | -4153756867136015425 |
| 11 | -122639671502190855423125 |
| 12 | 10862563623963550637392450625 |
| 13 | 2886411268723218638918559372525625 |
| 14 | -2300934493386669693418957707961899750625 |
[1,1,-1,-5,65,2665,-322465,-117699725, 128645799425,422086867913425,-4153756867136015425, -122639671502190855423125, 10862563623963550637392450625, 2886411268723218638918559372525625, -2300934493386669693418957707961899750625] |