The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | -1 |
| 10 | -1 |
| 11 | 41 |
| 12 | 41 |
| 13 | -589 |
| 14 | -589 |
| 15 | 8317 |
| 16 | 8317 |
| 17 | -869807 |
| 18 | -869807 |
| 19 | 43056421 |
| 20 | 43056421 |
| 21 | -250158593 |
| 22 | -250158593 |
| 23 | 67632514765 |
| 24 | 67632514765 |
| 25 | -1581439548217 |
| 26 | -1581439548217 |
[0,1,1,1,1,1,1,1,1,-1,-1,41,41,-589,-589,8317, 8317,-869807,-869807,43056421,43056421,-250158593, -250158593,67632514765,67632514765,-1581439548217, -1581439548217] |