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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -21 |
| 2 | 189 |
| 3 | -910 |
| 4 | 2205 |
| 5 | -378 |
| 6 | -13321 |
| 7 | 33345 |
| 8 | -10395 |
| 9 | -86870 |
| 10 | 122703 |
| 11 | 46683 |
| 12 | -98287 |
| 13 | -264915 |
| 14 | 96390 |
| 15 | 1163064 |
| 16 | -1113588 |
| 17 | -1066527 |
| 18 | 1042055 |
| 19 | 536025 |
| 20 | 2287467 |
| 21 | -3603805 |
| 22 | -1391733 |
| 23 | 478170 |
| 24 | -562555 |
| 25 | 13742379 |
| 26 | -7889805 |
[1,-21,189,-910,2205,-378,-13321,33345,-10395, -86870,122703,46683,-98287,-264915,96390,1163064, -1113588,-1066527,1042055,536025,2287467,-3603805, -1391733,478170,-562555,13742379,-7889805] |