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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -5 |
| 2 | -50 |
| 3 | -750 |
| 4 | -13125 |
| 5 | -249375 |
| 6 | -4987500 |
| 7 | -103312500 |
| 8 | -2195390625 |
| 9 | -47566796875 |
| 10 | -1046469531250 |
| 11 | -23307730468750 |
| 12 | -524423935546875 |
| 13 | -11900389306640625 |
| 14 | -272008898437500000 |
| 15 | -6256204664062500000 |
| 16 | -144674732856445312500 |
| 17 | -3361559969311523437500 |
[1,-5,-50,-750,-13125,-249375,-4987500,-103312500, -2195390625,-47566796875,-1046469531250, -23307730468750,-524423935546875, -11900389306640625,-272008898437500000, -6256204664062500000,-144674732856445312500, -3361559969311523437500] |