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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | -1 |
| 4 | 19 |
| 5 | -9 |
| 6 | 4315 |
| 7 | -1375 |
| 8 | 237671 |
| 9 | -114562 |
| 10 | 9751299 |
| 11 | -9458775 |
| 12 | 150653570023 |
| 13 | -24466579093 |
| 14 | 1719676921651 |
| 15 | -1681457720761 |
| 16 | 111956703448001 |
| 17 | -18293695492500 |
| 18 | 515820397142126323 |
| 19 | -168930583738812489 |
| 20 | 234948724145929620551 |
| 21 | -161867055619224199787 |
| 22 | 146676714003698721466337 |
[1,-1,19,-9,4315,-1375,237671,-114562,9751299, -9458775,150653570023,-24466579093,1719676921651, -1681457720761,111956703448001,-18293695492500, 515820397142126323,-168930583738812489, 234948724145929620551,-161867055619224199787, 146676714003698721466337] |