The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | -8 |
| 3 | 26 |
| 4 | 4008 |
| 5 | 288486 |
| 6 | 23670420 |
| 7 | 2395713498 |
| 8 | 304636017840 |
| 9 | 49472656345230 |
| 10 | 10516377983584300 |
| 11 | 2991272711709675554 |
| 12 | 1135988864475032518984 |
| 13 | 557539993775779096522774 |
[1,-4,-8,26,4008,288486,23670420,2395713498, 304636017840,49472656345230,10516377983584300, 2991272711709675554,1135988864475032518984, 557539993775779096522774] |