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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -103 |
| 3 | -2062 |
| 4 | -15759 |
| 5 | -75000 |
| 6 | -264311 |
| 7 | -745418 |
| 8 | -1706527 |
| 9 | -2829844 |
| 10 | -234375 |
| 11 | 29340954 |
| 12 | 208308817 |
| 13 | 1157954608 |
| 14 | 5998102121 |
| 15 | 30346718750 |
| 16 | 152319455169 |
| 17 | 762529114452 |
| 18 | 3814085045593 |
| 19 | 19072592456386 |
[1,4,-103,-2062,-15759,-75000,-264311,-745418, -1706527,-2829844,-234375,29340954,208308817, 1157954608,5998102121,30346718750,152319455169, 762529114452,3814085045593,19072592456386] |