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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | -5 |
| 5 | 13 |
| 6 | -30 |
| 7 | 75 |
| 8 | -200 |
| 9 | 524 |
| 10 | -1299 |
| 11 | 3038 |
| 12 | -6762 |
| 13 | 14482 |
| 14 | -30162 |
| 15 | 61691 |
| 16 | -124998 |
| 17 | 252744 |
| 18 | -512805 |
| 19 | 1047661 |
| 20 | -2158235 |
| 21 | 4481801 |
| 22 | -9368303 |
| 23 | 19674518 |
| 24 | -41437744 |
| 25 | 87399483 |
| 26 | -184412912 |
| 27 | 388975790 |
| 28 | -819684340 |
| 29 | 1724741941 |
| 30 | -3621720214 |
| 31 | 7585569484 |
| 32 | -15839701483 |
[1,2,4,-5,13,-30,75,-200,524,-1299,3038,-6762, 14482,-30162,61691,-124998,252744,-512805,1047661, -2158235,4481801,-9368303,19674518,-41437744, 87399483,-184412912,388975790,-819684340, 1724741941,-3621720214,7585569484,-15839701483] |