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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | -4 |
| 4 | 53 |
| 5 | -656 |
| 6 | 11917 |
| 7 | -244896 |
| 8 | 6080265 |
| 9 | -171274240 |
| 10 | 5480682041 |
| 11 | -195121452032 |
| 12 | 7672945614589 |
| 13 | -329902678161408 |
| 14 | 15405361461450885 |
| 15 | -776248476561903616 |
| 16 | 41985495698339969681 |
| 17 | -2426188309657908936704 |
| 18 | 149180887282915274036977 |
| 19 | -9725086440331395237937152 |
[1,0,1,-4,53,-656,11917,-244896,6080265, -171274240,5480682041,-195121452032,7672945614589, -329902678161408,15405361461450885, -776248476561903616,41985495698339969681, -2426188309657908936704,149180887282915274036977, -9725086440331395237937152] |