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 | 1 |
| 5 | -545 |
| 6 | -13805 |
| 7 | -301184 |
| 8 | -18551951 |
| 9 | -352513176 |
| 10 | -31451535983 |
| 11 | -1209153784888 |
| 12 | -87868166035113 |
| 13 | -4204963833160760 |
| 14 | -664087819207293468 |
[1,1,0,-1,1,-545,-13805,-301184,-18551951, -352513176,-31451535983,-1209153784888, -87868166035113,-4204963833160760, -664087819207293468] |