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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -4 |
| 3 | 12 |
| 4 | -28 |
| 5 | 40 |
| 6 | 200 |
| 7 | -3360 |
| 8 | 35680 |
| 9 | -357120 |
| 10 | 3644800 |
| 11 | -38896000 |
| 12 | 437756800 |
| 13 | -5206406400 |
| 14 | 65372153600 |
| 15 | -864339840000 |
| 16 | 11991424640000 |
| 17 | -173800340480000 |
| 18 | 2617640829440000 |
| 19 | -40693929269760000 |
| 20 | 647089190924800000 |
| 21 | -10383194262604800000 |
[1,0,-4,12,-28,40,200,-3360,35680,-357120,3644800, -38896000,437756800,-5206406400,65372153600, -864339840000,11991424640000,-173800340480000, 2617640829440000,-40693929269760000, 647089190924800000,-10383194262604800000] |