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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -30 |
| 3 | -100 |
| 4 | 262 |
| 5 | 3672 |
| 6 | 13836 |
| 7 | -80 |
| 8 | -264810 |
| 9 | -1421438 |
| 10 | -3019032 |
| 11 | 7630764 |
| 12 | 89648580 |
| 13 | 358974280 |
| 14 | 548677872 |
| 15 | -2390377936 |
| 16 | -20531491146 |
| 17 | -74635378020 |
| 18 | -110275527170 |
| 19 | 425036176572 |
| 20 | 3669041188152 |
| 21 | 13597190512480 |
| 22 | 23995331740700 |
| 23 | -45340748171760 |
[1,-2,-30,-100,262,3672,13836,-80,-264810, -1421438,-3019032,7630764,89648580,358974280, 548677872,-2390377936,-20531491146,-74635378020, -110275527170,425036176572,3669041188152, 13597190512480,23995331740700,-45340748171760] |