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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | -5 |
| 6 | 55 |
| 7 | -350 |
| 8 | 3969 |
| 9 | -31563 |
| 10 | 408050 |
| 11 | -3920950 |
| 12 | 58206676 |
| 13 | -657328100 |
| 14 | 11111159696 |
| 15 | -144321864960 |
| 16 | 2747845864464 |
| 17 | -40364369180016 |
| 18 | 856755330487200 |
| 19 | -14042902728462624 |
| 20 | 329258021171239296 |
| 21 | -5956512800554963584 |
| 22 | 153050034289602269952 |
| 23 | -3028534064042216488704 |
| 24 | 84691080748928315003904 |
[1,-5,55,-350,3969,-31563,408050,-3920950, 58206676,-657328100,11111159696,-144321864960, 2747845864464,-40364369180016,856755330487200, -14042902728462624,329258021171239296, -5956512800554963584,153050034289602269952, -3028534064042216488704,84691080748928315003904] |