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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -15 |
| 3 | -225 |
| 4 | 3297 |
| 5 | 973695 |
| 6 | 99434577 |
| 7 | 3364479391 |
| 8 | -1767300967487 |
| 9 | -640573924497921 |
| 10 | -102867079807004495 |
| 11 | 22939113754550703391 |
| 12 | 27513402069157221548193 |
| 13 | 11830594343212717024871295 |
[1,-1,-15,-225,3297,973695,99434577,3364479391, -1767300967487,-640573924497921, -102867079807004495,22939113754550703391, 27513402069157221548193, 11830594343212717024871295] |