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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -12 |
| 4 | -37 |
| 5 | 55 |
| 6 | 2352 |
| 7 | 11872 |
| 8 | -55963 |
| 9 | -1946147 |
| 10 | -12422168 |
| 11 | 127425716 |
| 12 | 4206315423 |
| 13 | 29351640435 |
| 14 | -573767182376 |
| 15 | -18652736291104 |
| 16 | -126637724451319 |
| 17 | 4546934751296505 |
| 18 | 146709365362329136 |
[1,1,0,-12,-37,55,2352,11872,-55963,-1946147, -12422168,127425716,4206315423,29351640435, -573767182376,-18652736291104,-126637724451319, 4546934751296505,146709365362329136] |