The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -5 |
| 4 | -15 |
| 5 | 0 |
| 6 | 170 |
| 7 | 619 |
| 8 | 69 |
| 9 | -8351 |
| 10 | -33601 |
| 11 | -8446 |
| 12 | 480679 |
| 13 | 2078534 |
| 14 | 830739 |
| 15 | -30221481 |
| 16 | -138791261 |
| 17 | -76306831 |
| 18 | 2009474129 |
| 19 | 9742939809 |
| 20 | 6811893809 |
| 21 | -138835809721 |
| 22 | -708398431831 |
| 23 | -599833654686 |
| 24 | 9861055840019 |
| 25 | 52859680413599 |
| 26 | 52446605719469 |
[1,1,0,-5,-15,0,170,619,69,-8351,-33601,-8446, 480679,2078534,830739,-30221481,-138791261, -76306831,2009474129,9742939809,6811893809, -138835809721,-708398431831,-599833654686, 9861055840019,52859680413599,52446605719469] |