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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -5 |
| 3 | -11 |
| 4 | 19 |
| 5 | 85 |
| 6 | -29 |
| 7 | -539 |
| 8 | -365 |
| 9 | 2869 |
| 10 | 5059 |
| 11 | -12155 |
| 12 | -42509 |
| 13 | 30421 |
| 14 | 285475 |
| 15 | 102949 |
| 16 | -1609901 |
| 17 | -2227595 |
| 18 | 7431811 |
| 19 | 20797381 |
| 20 | -23793485 |
| 21 | -148577771 |
| 22 | -5816861 |
| 23 | 885649765 |
| 24 | 920550931 |
| 25 | -4393347659 |
| 26 | -9916653245 |
| 27 | 16443432709 |
[1,1,-5,-11,19,85,-29,-539,-365,2869,5059,-12155, -42509,30421,285475,102949,-1609901,-2227595, 7431811,20797381,-23793485,-148577771,-5816861, 885649765,920550931,-4393347659,-9916653245, 16443432709] |