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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 16 |
| 4 | -104 |
| 5 | -20096 |
| 6 | 4427776 |
| 7 | -954111872 |
| 8 | 243390205696 |
| 9 | -75389245067264 |
| 10 | 28248828019830784 |
| 11 | -12669814369258471424 |
| 12 | 6721694045416881553408 |
| 13 | -4170436153219300846567424 |
| 14 | 2994608522937575414450814976 |
[1,-2,16,-104,-20096,4427776,-954111872, 243390205696,-75389245067264,28248828019830784, -12669814369258471424,6721694045416881553408, -4170436153219300846567424, 2994608522937575414450814976] |