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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 8 |
| 5 | 9 |
| 6 | 19 |
| 7 | -15 |
| 8 | 216 |
| 9 | -1407 |
| 10 | 11803 |
| 11 | -108483 |
| 12 | 1106192 |
| 13 | -12363703 |
| 14 | 150381243 |
| 15 | -1977666743 |
| 16 | 27965386320 |
| 17 | -423158076351 |
| 18 | 6822782712723 |
| 19 | -116781368777867 |
| 20 | 2114916140765496 |
| 21 | -40404117909336247 |
| 22 | 812091479233464131 |
| 23 | -17130720178674680031 |
| 24 | 378423227774537955688 |
[0,1,3,5,8,9,19,-15,216,-1407,11803,-108483, 1106192,-12363703,150381243,-1977666743, 27965386320,-423158076351,6822782712723, -116781368777867,2114916140765496, -40404117909336247,812091479233464131, -17130720178674680031,378423227774537955688] |