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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -4 |
| 2 | 230 |
| 3 | -7880 |
| 4 | 680458 |
| 5 | -77968460 |
| 6 | 12944005230 |
| 7 | -2852439671952 |
| 8 | 810954585734418 |
| 9 | -288565474593329044 |
| 10 | 125662055644822916342 |
| 11 | -65733137963856533872984 |
| 12 | 40670869816508001470654746 |
[2,-4,230,-7880,680458,-77968460,12944005230, -2852439671952,810954585734418, -288565474593329044,125662055644822916342, -65733137963856533872984, 40670869816508001470654746] |