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| n | a(n) |
|---|---|
| 0 | -2 |
| 1 | -6 |
| 2 | 9 |
| 3 | -18 |
| 4 | 21 |
| 5 | -15 |
| 6 | -54 |
| 7 | 57 |
| 8 | -51 |
| 9 | 375 |
| 10 | -162 |
| 11 | 165 |
| 12 | -159 |
| 13 | 1131 |
| 14 | 4666413 |
| 15 | -486 |
| 16 | 489 |
| 17 | -483 |
| 18 | 3399 |
| 19 | 98015025 |
| 20 | 148865383434975 |
| 21 | -1458 |
| 22 | 1461 |
| 23 | -1455 |
| 24 | 10203 |
| 25 | 2058376701 |
| 26 | 46892624598373299 |
| 27 | 83234757492356072395126701 |
[-2,-6,9,-18,21,-15,-54,57,-51,375,-162,165,-159, 1131,4666413,-486,489,-483,3399,98015025, 148865383434975,-1458,1461,-1455,10203,2058376701, 46892624598373299,83234757492356072395126701] |