The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 5 |
| 7 | -18 |
| 8 | 27 |
| 9 | 67 |
| 10 | -496 |
| 11 | 496 |
| 12 | 6963 |
| 13 | -24246 |
| 14 | -148002 |
| 15 | 1138045 |
| 16 | 3360042 |
| 17 | -58828040 |
| 18 | -33243252 |
| 19 | 3312139446 |
| 20 | -5235582541 |
| 21 | -204462055464 |
| 22 | 726496668085 |
| 23 | 14922365946662 |
| 24 | -84161948692035 |
| 25 | -1310383972147810 |
[1,-1,1,-1,0,5,-18,27,67,-496,496,6963,-24246, -148002,1138045,3360042,-58828040,-33243252, 3312139446,-5235582541,-204462055464,726496668085, 14922365946662,-84161948692035,-1310383972147810] |