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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -2 |
| 3 | -14 |
| 4 | -184 |
| 5 | -3532 |
| 6 | -89256 |
| 7 | -2800016 |
| 8 | -104967808 |
| 9 | -4578528464 |
| 10 | -227816059360 |
| 11 | -12735645181536 |
| 12 | -790296855912576 |
| 13 | -53905019035510528 |
| 14 | -4008716449677965312 |
| 15 | -322807879692969879552 |
| 16 | -27983800239966141382656 |
| 17 | -2598368754552749176202496 |
| 18 | -257284990746988090769530368 |
[1,-1,-2,-14,-184,-3532,-89256,-2800016, -104967808,-4578528464,-227816059360, -12735645181536,-790296855912576, -53905019035510528,-4008716449677965312, -322807879692969879552,-27983800239966141382656, -2598368754552749176202496, -257284990746988090769530368] |