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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 19 |
| 3 | -2561 |
| 4 | 874831 |
| 5 | -319094777 |
| 6 | 47095708213409 |
| 7 | -751163826506551 |
| 8 | 281559662236405100437 |
| 9 | -49061598325832137241324057 |
| 10 | 5012066724315488368700829665081 |
| 11 | -26602063280041700132088988446735433 |
| 12 | 40762630349420684160007591156102493590477 |
[1,-1,19,-2561,874831,-319094777,47095708213409, -751163826506551,281559662236405100437, -49061598325832137241324057, 5012066724315488368700829665081, -26602063280041700132088988446735433, 40762630349420684160007591156102493590477] |