The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | -57 |
| 4 | 4513 |
| 5 | -362737 |
| 6 | 43685409 |
| 7 | -7472568937 |
| 8 | 1694762362561 |
| 9 | -492370173816033 |
| 10 | 178467092014537921 |
| 11 | -78960125273223620761 |
| 12 | 41880334808869380979041 |
| 13 | -26232480244560931030777297 |
[1,-1,1,-57,4513,-362737,43685409,-7472568937, 1694762362561,-492370173816033,178467092014537921, -78960125273223620761,41880334808869380979041, -26232480244560931030777297] |