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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 12 |
| 5 | -60 |
| 6 | 90 |
| 7 | -420 |
| 8 | 15008 |
| 9 | -149184 |
| 10 | 572040 |
| 11 | -4263600 |
| 12 | 153746472 |
| 13 | -2274880608 |
| 14 | 14574976416 |
| 15 | -151922927520 |
| 16 | 6077379610368 |
| 17 | -119360435727744 |
| 18 | 1090133783570880 |
| 19 | -14675613664063104 |
[1,0,0,0,12,-60,90,-420,15008,-149184,572040, -4263600,153746472,-2274880608,14574976416, -151922927520,6077379610368,-119360435727744, 1090133783570880,-14675613664063104] |