The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | 1 |
| 4 | -7 |
| 5 | 1 |
| 6 | 97 |
| 7 | -55 |
| 8 | -2063 |
| 9 | 143 |
| 10 | 17803 |
| 11 | -968167 |
| 12 | -250781 |
| 13 | 7000033 |
| 14 | -166831871 |
| 15 | -571772647 |
| 16 | 43685848289 |
| 17 | 843598411471 |
| 18 | -447550424579 |
| 19 | -1263845119891 |
| 20 | 84677077231169 |
| 21 | 740683182137153 |
| 22 | -11657476758734011 |
| 23 | -474904166544135457 |
| 24 | 28924058075775365981 |
| 25 | -2379183287545454197 |
[1,-1,1,1,-7,1,97,-55,-2063,143,17803,-968167, -250781,7000033,-166831871,-571772647,43685848289, 843598411471,-447550424579,-1263845119891, 84677077231169,740683182137153,-11657476758734011, -474904166544135457,28924058075775365981, -2379183287545454197] |