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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | -6 |
| 4 | -24 |
| 5 | -60 |
| 6 | 240 |
| 7 | 4830 |
| 8 | 39984 |
| 9 | 180936 |
| 10 | -605520 |
| 11 | -24616350 |
| 12 | -318005160 |
| 13 | -2385790836 |
| 14 | -86488584 |
| 15 | 350543790870 |
| 16 | 6917020827360 |
| 17 | 79778558317200 |
| 18 | 357117438258144 |
| 19 | -9237998478286134 |
| 20 | -304182278908538040 |
| 21 | -5166739059890655660 |
| 22 | -48968796671246843160 |
[1,0,0,-6,-24,-60,240,4830,39984,180936,-605520, -24616350,-318005160,-2385790836,-86488584, 350543790870,6917020827360,79778558317200, 357117438258144,-9237998478286134, -304182278908538040,-5166739059890655660, -48968796671246843160] |