The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 17 |
| 5 | -339 |
| 6 | 4999 |
| 7 | -63587 |
| 8 | 566145 |
| 9 | 3549241 |
| 10 | -405637489 |
| 11 | 15518099961 |
| 12 | -446235202799 |
| 13 | 9617693853925 |
| 14 | -75522664207017 |
| 15 | -7341781870733099 |
| 16 | 596513949276803969 |
| 17 | -30104875035438797583 |
| 18 | 1144712508931072057375 |
| 19 | -27381639204739332379151 |
[1,1,-1,1,17,-339,4999,-63587,566145,3549241, -405637489,15518099961,-446235202799, 9617693853925,-75522664207017,-7341781870733099, 596513949276803969,-30104875035438797583, 1144712508931072057375,-27381639204739332379151] |