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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | -16 |
| 5 | -168 |
| 6 | -928 |
| 7 | -880 |
| 8 | 57472 |
| 9 | 897792 |
| 10 | 7304192 |
| 11 | -4100864 |
| 12 | -1356949504 |
| 13 | -27044864000 |
| 14 | -271226560512 |
| 15 | 1097459304448 |
| 16 | 114089524002816 |
| 17 | 2671773715300352 |
| 18 | 29775666324832256 |
| 19 | -316640482329755648 |
[0,1,2,2,-16,-168,-928,-880,57472,897792,7304192, -4100864,-1356949504,-27044864000,-271226560512, 1097459304448,114089524002816,2671773715300352, 29775666324832256,-316640482329755648] |