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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -16 |
| 2 | 440 |
| 3 | -25856 |
| 4 | 2460448 |
| 5 | -335955200 |
| 6 | 62060029824 |
| 7 | -14940576792576 |
| 8 | 4555904588849664 |
| 9 | -1719063029232504832 |
| 10 | 787080093043649165312 |
| 11 | -430107147338505961406464 |
| 12 | 276606088476056370612084736 |
[2,-16,440,-25856,2460448,-335955200,62060029824, -14940576792576,4555904588849664, -1719063029232504832,787080093043649165312, -430107147338505961406464, 276606088476056370612084736] |