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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -5 |
| 3 | 37 |
| 4 | -310 |
| 5 | 2795 |
| 6 | -26352 |
| 7 | 256257 |
| 8 | -2548875 |
| 9 | 25793149 |
| 10 | -264579518 |
| 11 | 2743935678 |
| 12 | -28716005918 |
| 13 | 302812817148 |
| 14 | -3213908529802 |
| 15 | 34301475340630 |
| 16 | -367873673112308 |
| 17 | 3962187547336323 |
[1,1,-5,37,-310,2795,-26352,256257,-2548875, 25793149,-264579518,2743935678,-28716005918, 302812817148,-3213908529802,34301475340630, -367873673112308,3962187547336323] |