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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1728 |
| 3 | -3375 |
| 4 | 8000 |
| 5 | -32768 |
| 6 | 54000 |
| 7 | -191025 |
| 8 | 287496 |
| 9 | -884736 |
| 10 | 1264000 |
| 11 | -3491750 |
| 12 | 4834944 |
| 13 | -12288000 |
| 14 | 16581375 |
| 15 | -39491307 |
| 16 | 52250000 |
| 17 | -117964800 |
| 18 | 153542016 |
| 19 | -331531596 |
| 20 | 425692800 |
| 21 | -884736000 |
| 22 | 1122662608 |
| 23 | -2257834125 |
| 24 | 2835810000 |
| 25 | -5541101568 |
| 26 | 6896880000 |
| 27 | -13136684625 |
[0,1728,-3375,8000,-32768,54000,-191025,287496, -884736,1264000,-3491750,4834944,-12288000, 16581375,-39491307,52250000,-117964800,153542016, -331531596,425692800,-884736000,1122662608, -2257834125,2835810000,-5541101568,6896880000, -13136684625] |