The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 9 |
| 3 | -249 |
| 4 | 11953 |
| 5 | -992401 |
| 6 | 115133433 |
| 7 | -19289685193 |
| 8 | 4104153335777 |
| 9 | -1154213252748193 |
| 10 | 390283459641717353 |
| 11 | -165544701587974757145 |
| 12 | 81456402896849322863505 |
| 13 | -48584594120969426596224305 |
[1,-1,9,-249,11953,-992401,115133433,-19289685193, 4104153335777,-1154213252748193, 390283459641717353,-165544701587974757145, 81456402896849322863505, -48584594120969426596224305] |