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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | -18 |
| 4 | -2200 |
| 5 | -150150 |
| 6 | -11618004 |
| 7 | -1078005082 |
| 8 | -118928710576 |
| 9 | -15184771406478 |
| 10 | -2148536703814700 |
| 11 | -309605570133329954 |
| 12 | -34193099991177752904 |
| 13 | 4268254817856544829418 |
| 14 | 6637048590856623019431932 |
[0,2,4,-18,-2200,-150150,-11618004,-1078005082, -118928710576,-15184771406478,-2148536703814700, -309605570133329954,-34193099991177752904, 4268254817856544829418,6637048590856623019431932] |