The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 3 |
| 3 | -7 |
| 4 | 19 |
| 5 | -51 |
| 6 | 61 |
| 7 | 167 |
| 8 | 6777 |
| 9 | -107929 |
| 10 | 1650691 |
| 11 | -17839911 |
| 12 | 157217083 |
| 13 | -1229269627 |
| 14 | 6185945949 |
| 15 | -3251776921 |
| 16 | -1151787785999 |
| 17 | 10138302541647 |
| 18 | 532690324952707 |
| 19 | -14122245788830279 |
| 20 | 443912721023736291 |
| 21 | -7480012715591067331 |
| 22 | 115775303074594208893 |
| 23 | -1392396864130912381017 |
[1,-1,3,-7,19,-51,61,167,6777,-107929,1650691, -17839911,157217083,-1229269627,6185945949, -3251776921,-1151787785999,10138302541647, 532690324952707,-14122245788830279, 443912721023736291,-7480012715591067331, 115775303074594208893,-1392396864130912381017] |