The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -4095 |
| 3 | 531442 |
| 4 | -16781311 |
| 5 | 244140626 |
| 6 | -2176254990 |
| 7 | 13841287202 |
| 8 | -68736258047 |
| 9 | 282430067923 |
| 10 | -999755863470 |
| 11 | 3138428376722 |
| 12 | -8918293480462 |
| 13 | 23298085122482 |
| 14 | -56680071092190 |
| 15 | 129746582562692 |
| 16 | -281543712968703 |
| 17 | 582622237229762 |
| 18 | -1156551128144685 |
| 19 | 2213314919066162 |
| 20 | -4096999772640686 |
[1,-4095,531442,-16781311,244140626,-2176254990, 13841287202,-68736258047,282430067923, -999755863470,3138428376722,-8918293480462, 23298085122482,-56680071092190,129746582562692, -281543712968703,582622237229762, -1156551128144685,2213314919066162, -4096999772640686] |