The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 3 |
| 3 | -9 |
| 4 | 29 |
| 5 | -94 |
| 6 | 304 |
| 7 | -974 |
| 8 | 3095 |
| 9 | -9809 |
| 10 | 31295 |
| 11 | -101459 |
| 12 | 335712 |
| 13 | -1128103 |
| 14 | 3796221 |
| 15 | -12567881 |
| 16 | 40382747 |
| 17 | -126022996 |
| 18 | 392875458 |
| 19 | -1300518891 |
| 20 | 4821378972 |
| 21 | -19442392758 |
| 22 | 76612026077 |
| 23 | -258487216389 |
| 24 | 602418545348 |
| 25 | -104469005952 |
| 26 | -6657105734736 |
| 27 | 22616539538599 |
| 28 | 115937698147766 |
| 29 | -1859472149450154 |
| 30 | 11984970173891003 |
| 31 | -40825530158762433 |
| 32 | -37716293058857145 |
| 33 | 1564659680870999322 |
[1,-1,3,-9,29,-94,304,-974,3095,-9809,31295, -101459,335712,-1128103,3796221,-12567881, 40382747,-126022996,392875458,-1300518891, 4821378972,-19442392758,76612026077,-258487216389, 602418545348,-104469005952,-6657105734736, 22616539538599,115937698147766,-1859472149450154, 11984970173891003,-40825530158762433, -37716293058857145,1564659680870999322] |