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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -16 |
| 3 | 288 |
| 4 | -9920 |
| 5 | 541184 |
| 6 | -42274816 |
| 7 | 4449451776 |
| 8 | -605255720960 |
| 9 | 103187353223168 |
| 10 | -21528004660707328 |
| 11 | 5391886872902762496 |
| 12 | -1595781555670951657472 |
| 13 | 550728986895462989103104 |
[0,2,-16,288,-9920,541184,-42274816,4449451776, -605255720960,103187353223168,-21528004660707328, 5391886872902762496,-1595781555670951657472, 550728986895462989103104] |