| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 4 |
| 3 | 32 |
| 4 | 400 |
| 5 | -3680 |
| 6 | -719168 |
| 7 | -45313024 |
| 8 | -1201882880 |
| 9 | 190738937344 |
| 10 | 41876315935744 |
| 11 | 3729103532367872 |
| 12 | -442609357053390848 |
| 13 | -294584246423093633024 |
| 14 | -75554765797484141625344 |
| 15 | -7698772402123265223688192 |
| 16 | 3712165683571701387680088064 |
[1,-2,4,32,400,-3680,-719168,-45313024, -1201882880,190738937344,41876315935744, 3729103532367872,-442609357053390848, -294584246423093633024,-75554765797484141625344, -7698772402123265223688192, 3712165683571701387680088064] |