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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -7 |
| 2 | 21 |
| 3 | -42 |
| 4 | 84 |
| 5 | -175 |
| 6 | 322 |
| 7 | -547 |
| 8 | 931 |
| 9 | -1561 |
| 10 | 2527 |
| 11 | -3976 |
| 12 | 6167 |
| 13 | -9485 |
| 14 | 14336 |
| 15 | -21280 |
| 16 | 31304 |
| 17 | -45696 |
| 18 | 65940 |
| 19 | -94122 |
| 20 | 133371 |
| 21 | -187734 |
| 22 | 262143 |
| 23 | -363265 |
| 24 | 500381 |
| 25 | -685503 |
| 26 | 933506 |
| 27 | -1263794 |
| 28 | 1702590 |
| 29 | -2283379 |
| 30 | 3047597 |
[1,-7,21,-42,84,-175,322,-547,931,-1561,2527, -3976,6167,-9485,14336,-21280,31304,-45696,65940, -94122,133371,-187734,262143,-363265,500381, -685503,933506,-1263794,1702590,-2283379,3047597] |