The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | -1 |
| 4 | -43 |
| 5 | -221 |
| 6 | -89513 |
| 7 | -149749 |
| 8 | -1084711 |
| 9 | -209435 |
| 10 | -27633784271 |
| 11 | -1480512386621 |
| 12 | -7957100794591 |
| 13 | -26770890495311 |
| 14 | -8901132809862257 |
| 15 | -397417885842749047 |
| 16 | -4636876735719615641 |
[1,-1,-1,-43,-221,-89513,-149749,-1084711,-209435, -27633784271,-1480512386621,-7957100794591, -26770890495311,-8901132809862257, -397417885842749047,-4636876735719615641] |