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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -3 |
| 2 | 36 |
| 3 | -189 |
| 4 | 567 |
| 5 | -2430 |
| 6 | 9477 |
| 7 | -28431 |
| 8 | 104976 |
| 9 | -373977 |
| 10 | 1121931 |
| 11 | -3897234 |
| 12 | 13286025 |
| 13 | -39858075 |
| 14 | 133923132 |
| 15 | -444816117 |
| 16 | 1334448351 |
| 17 | -4390765542 |
| 18 | 14334558093 |
| 19 | -43003674279 |
| 20 | 139471376040 |
| 21 | -449795187729 |
| 22 | 1349385563187 |
| 23 | -4330586226042 |
| 24 | 13839047287569 |
[1,-3,36,-189,567,-2430,9477,-28431,104976, -373977,1121931,-3897234,13286025,-39858075, 133923132,-444816117,1334448351,-4390765542, 14334558093,-43003674279,139471376040, -449795187729,1349385563187,-4330586226042, 13839047287569] |