The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | 3 |
| 6 | 2 |
| 7 | -9 |
| 8 | -12 |
| 9 | 35 |
| 10 | 78 |
| 11 | -153 |
| 12 | -544 |
| 13 | 723 |
| 14 | 4170 |
| 15 | -3337 |
| 16 | -35028 |
| 17 | 10851 |
| 18 | 320678 |
| 19 | 57255 |
| 20 | -3178152 |
| 21 | -2190253 |
| 22 | 33864546 |
| 23 | 42120183 |
| 24 | -385314460 |
| 25 | -719159517 |
| 26 | 4649508222 |
| 27 | 12033407591 |
| 28 | -59076411312 |
| 29 | -204022615725 |
| 30 | 784134861818 |
| 31 | 3554417974647 |
| 32 | -10768948801764 |
[1,1,0,-1,0,3,2,-9,-12,35,78,-153,-544,723,4170, -3337,-35028,10851,320678,57255,-3178152,-2190253, 33864546,42120183,-385314460,-719159517, 4649508222,12033407591,-59076411312,-204022615725, 784134861818,3554417974647,-10768948801764] |