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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | -5 |
| 5 | 27 |
| 6 | -277 |
| 7 | 895 |
| 8 | -27655 |
| 9 | 248185 |
| 10 | -5052519 |
| 11 | 28731489 |
| 12 | -1444496477 |
| 13 | 19885473347 |
| 14 | -595129566605 |
| 15 | 4808968469791 |
| 16 | -333894246376015 |
| 17 | 6195249562217393 |
| 18 | -244725707175834895 |
| 19 | 2563206341379247681 |
| 20 | -227039228335442728053 |
| 21 | 5299214394077195384747 |
| 22 | -260053313429315175721413 |
[1,1,1,1,-5,27,-277,895,-27655,248185,-5052519, 28731489,-1444496477,19885473347,-595129566605, 4808968469791,-333894246376015,6195249562217393, -244725707175834895,2563206341379247681, -227039228335442728053,5299214394077195384747, -260053313429315175721413] |