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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -48 |
| 3 | 504 |
| 4 | -2368 |
| 5 | 9660 |
| 6 | -24192 |
| 7 | -33488 |
| 8 | 239616 |
| 9 | -163782 |
| 10 | -463680 |
| 11 | 1069224 |
| 12 | -1193472 |
| 13 | -1155476 |
| 14 | 1607424 |
| 15 | 4868640 |
| 16 | 86016 |
| 17 | -13811868 |
| 18 | 7861536 |
| 19 | 21322840 |
| 20 | -22874880 |
| 21 | -16877952 |
| 22 | -51322752 |
| 23 | 37286544 |
| 24 | 120766464 |
| 25 | -27669550 |
| 26 | 55462848 |
| 27 | -203834232 |
[1,-48,504,-2368,9660,-24192,-33488,239616, -163782,-463680,1069224,-1193472,-1155476,1607424, 4868640,86016,-13811868,7861536,21322840, -22874880,-16877952,-51322752,37286544,120766464, -27669550,55462848,-203834232] |