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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -16 |
| 3 | 8 |
| 4 | 12672 |
| 5 | 571264 |
| 6 | -44351360 |
| 7 | -12355211520 |
| 8 | -452681248768 |
| 9 | 478190483394560 |
| 10 | 132554796040912896 |
| 11 | -18854516962334277632 |
| 12 | -27186884683859043123200 |
| 13 | -5502410397289951851773952 |
| 14 | 6273206188133923322747420672 |
| 15 | 5389680791235134726930445369344 |
[1,-2,-16,8,12672,571264,-44351360,-12355211520, -452681248768,478190483394560,132554796040912896, -18854516962334277632,-27186884683859043123200, -5502410397289951851773952, 6273206188133923322747420672, 5389680791235134726930445369344] |