The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 2 |
| 3 | 35 |
| 4 | -140 |
| 5 | 986 |
| 6 | -6643 |
| 7 | 48248 |
| 8 | -362700 |
| 9 | 2802510 |
| 10 | -22098991 |
| 11 | 177116726 |
| 12 | -1438544962 |
| 13 | 11814206036 |
| 14 | -97940651274 |
| 15 | 818498739637 |
| 16 | -6888195294592 |
| 17 | 58324130994782 |
| 18 | -496519067059432 |
| 19 | 4247266246317414 |
| 20 | -36488059346439524 |
[1,5,2,35,-140,986,-6643,48248,-362700,2802510, -22098991,177116726,-1438544962,11814206036, -97940651274,818498739637,-6888195294592, 58324130994782,-496519067059432,4247266246317414, -36488059346439524] |