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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -3 |
| 3 | -11 |
| 4 | 1 |
| 5 | 81 |
| 6 | 141 |
| 7 | -363 |
| 8 | -1791 |
| 9 | -479 |
| 10 | 13597 |
| 11 | 29877 |
| 12 | -54911 |
| 13 | -353807 |
| 14 | -223443 |
| 15 | 2539989 |
| 16 | 6806529 |
| 17 | -8302527 |
| 18 | -73999299 |
| 19 | -73313931 |
| 20 | 489731841 |
| 21 | 1584548241 |
| 22 | -1110170163 |
| 23 | -15812965611 |
| 24 | -21391839999 |
| 25 | 94696016481 |
[1,1,-3,-11,1,81,141,-363,-1791,-479,13597,29877, -54911,-353807,-223443,2539989,6806529,-8302527, -73999299,-73313931,489731841,1584548241, -1110170163,-15812965611,-21391839999,94696016481] |