The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 2 |
| 4 | -4 |
| 5 | 1 |
| 6 | 7 |
| 7 | -21 |
| 8 | 9 |
| 9 | -1 |
| 10 | 34 |
| 11 | -146 |
| 12 | 83 |
| 13 | -16 |
| 14 | 1 |
| 15 | 201 |
| 16 | -1277 |
| 17 | 878 |
| 18 | -226 |
| 19 | 25 |
| 20 | -1 |
| 21 | 1266 |
| 22 | -13504 |
| 23 | 10729 |
| 24 | -3340 |
| 25 | 500 |
| 26 | -36 |
| 27 | 1 |
| 28 | 6063 |
| 29 | -167689 |
| 30 | 149971 |
| 31 | -53679 |
| 32 | 9805 |
| 33 | -967 |
| 34 | 49 |
| 35 | -1 |
| 36 | -44190 |
| 37 | -2392326 |
| 38 | 2368995 |
| 39 | -946036 |
| 40 | 199829 |
[1,-1,2,-4,1,7,-21,9,-1,34,-146,83,-16,1,201, -1277,878,-226,25,-1,1266,-13504,10729,-3340,500, -36,1,6063,-167689,149971,-53679,9805,-967,49,-1, -44190,-2392326,2368995,-946036,199829] |