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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 2 |
| 3 | -4 |
| 4 | 8 |
| 5 | -12 |
| 6 | 20 |
| 7 | -36 |
| 8 | 60 |
| 9 | -100 |
| 10 | 172 |
| 11 | -292 |
| 12 | 492 |
| 13 | -836 |
| 14 | 1420 |
| 15 | -2404 |
| 16 | 4076 |
| 17 | -6916 |
| 18 | 11724 |
| 19 | -19876 |
| 20 | 33708 |
| 21 | -57156 |
| 22 | 96908 |
| 23 | -164324 |
| 24 | 278636 |
| 25 | -472452 |
| 26 | 801100 |
| 27 | -1358372 |
| 28 | 2303276 |
| 29 | -3905476 |
| 30 | 6622220 |
| 31 | -11228772 |
| 32 | 19039724 |
| 33 | -32284164 |
| 34 | 54741708 |
| 35 | -92821156 |
| 36 | 157389484 |
| 37 | -266872900 |
[1,-2,2,-4,8,-12,20,-36,60,-100,172,-292,492,-836, 1420,-2404,4076,-6916,11724,-19876,33708,-57156, 96908,-164324,278636,-472452,801100,-1358372, 2303276,-3905476,6622220,-11228772,19039724, -32284164,54741708,-92821156,157389484,-266872900] |