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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -1 |
| 3 | 0 |
| 4 | -3 |
| 5 | -6 |
| 6 | -38 |
| 7 | -186 |
| 8 | -1181 |
| 9 | -8094 |
| 10 | -61865 |
| 11 | -516702 |
| 12 | -4688020 |
| 13 | -45887352 |
| 14 | -481954769 |
| 15 | -5406249972 |
| 16 | -64506680939 |
| 17 | -815807306442 |
| 18 | -10901200843386 |
| 19 | -153475188129114 |
| 20 | -2270769144678657 |
| 21 | -35226976789341426 |
| 22 | -571781884343282417 |
| 23 | -9691701188493783546 |
[1,0,-1,0,-3,-6,-38,-186,-1181,-8094,-61865, -516702,-4688020,-45887352,-481954769,-5406249972, -64506680939,-815807306442,-10901200843386, -153475188129114,-2270769144678657, -35226976789341426,-571781884343282417, -9691701188493783546] |