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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -5 |
| 2 | 35 |
| 3 | -185 |
| 4 | 1235 |
| 5 | -6785 |
| 6 | 43835 |
| 7 | -247385 |
| 8 | 1562435 |
| 9 | -8983985 |
| 10 | 55857035 |
| 11 | -325376585 |
| 12 | 2001087635 |
| 13 | -11762385185 |
| 14 | 71795014235 |
| 15 | -424666569785 |
| 16 | 2578516996835 |
| 17 | -15318514090385 |
| 18 | 92674023995435 |
| 19 | -552229446706985 |
[1,-5,35,-185,1235,-6785,43835,-247385,1562435, -8983985,55857035,-325376585,2001087635, -11762385185,71795014235,-424666569785, 2578516996835,-15318514090385,92674023995435, -552229446706985] |