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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | -9 |
| 3 | -198 |
| 4 | 1188 |
| 5 | 30213 |
| 6 | -220239 |
| 7 | -5945238 |
| 8 | 47541735 |
| 9 | 1325876283 |
| 10 | -11192990913 |
| 11 | -318640183182 |
| 12 | 2787445591416 |
| 13 | 80483342059224 |
| 14 | -722019579525288 |
| 15 | -21063846331387728 |
| 16 | 192542324985927324 |
| 17 | 5661585516173303268 |
| 18 | -52508399485861250604 |
| 19 | -1553593208517770295816 |
[1,3,-9,-198,1188,30213,-220239,-5945238,47541735, 1325876283,-11192990913,-318640183182, 2787445591416,80483342059224,-722019579525288, -21063846331387728,192542324985927324, 5661585516173303268,-52508399485861250604, -1553593208517770295816] |