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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | -11 |
| 5 | 741 |
| 6 | -14129 |
| 7 | 521263 |
| 8 | -20968359 |
| 9 | 1063764649 |
| 10 | -63316356389 |
| 11 | 4408796480331 |
| 12 | -352958649497387 |
| 13 | 32158017135672013 |
| 14 | -3302679619545572265 |
| 15 | 379346145007147112551 |
| 16 | -48397471256028983134799 |
| 17 | 6817654800019973404119633 |
| 18 | -1054828080584161260522077645 |
[1,1,1,7,-11,741,-14129,521263,-20968359, 1063764649,-63316356389,4408796480331, -352958649497387,32158017135672013, -3302679619545572265,379346145007147112551, -48397471256028983134799, 6817654800019973404119633, -1054828080584161260522077645] |