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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -2 |
| 3 | 22 |
| 4 | 94 |
| 5 | -890 |
| 6 | -9170 |
| 7 | 67030 |
| 8 | 1495870 |
| 9 | -6581210 |
| 10 | -362016050 |
| 11 | 194447350 |
| 12 | 120002960350 |
| 13 | 554823694150 |
| 14 | -51277487618450 |
| 15 | -601106981110250 |
| 16 | 26775789844186750 |
| 17 | 591304973974171750 |
| 18 | -16113120605399179250 |
[1,-2,-2,22,94,-890,-9170,67030,1495870,-6581210, -362016050,194447350,120002960350,554823694150, -51277487618450,-601106981110250, 26775789844186750,591304973974171750, -16113120605399179250] |