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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -2 |
| 4 | 0 |
| 5 | 4 |
| 6 | 12 |
| 7 | -8 |
| 8 | -48 |
| 9 | -56 |
| 10 | -144 |
| 11 | 400 |
| 12 | 1200 |
| 13 | 1792 |
| 14 | 960 |
| 15 | 16864 |
| 16 | -34560 |
| 17 | -170816 |
| 18 | -320064 |
| 19 | -632960 |
| 20 | -869376 |
| 21 | -15780224 |
| 22 | 30636288 |
| 23 | 144493312 |
| 24 | 360770304 |
| 25 | 738095104 |
| 26 | 2382729216 |
| 27 | 6661606912 |
| 28 | 81815537664 |
| 29 | -152267942912 |
| 30 | -883849860096 |
| 31 | -2187970242560 |
| 32 | -6499788165120 |
[1,1,0,-2,0,4,12,-8,-48,-56,-144,400,1200,1792, 960,16864,-34560,-170816,-320064,-632960,-869376, -15780224,30636288,144493312,360770304,738095104, 2382729216,6661606912,81815537664,-152267942912, -883849860096,-2187970242560,-6499788165120] |