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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -39 |
| 3 | -604 |
| 4 | -3471 |
| 5 | -12500 |
| 6 | -31031 |
| 7 | -39524 |
| 8 | 128481 |
| 9 | 1421684 |
| 10 | 8765625 |
| 11 | 47056564 |
| 12 | 241154641 |
| 13 | 1215876316 |
| 14 | 6095986089 |
| 15 | 30506187500 |
| 16 | 152571113409 |
| 17 | 762915315556 |
| 18 | 3814663253401 |
| 19 | 19073439282244 |
| 20 | 95367367640625 |
[1,4,-39,-604,-3471,-12500,-31031,-39524,128481, 1421684,8765625,47056564,241154641,1215876316, 6095986089,30506187500,152571113409,762915315556, 3814663253401,19073439282244,95367367640625] |