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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | -30 |
| 4 | -411 |
| 5 | -4698 |
| 6 | -45824 |
| 7 | -428661 |
| 8 | -4000209 |
| 9 | -37149512 |
| 10 | -345401797 |
| 11 | -3220550623 |
| 12 | -30125571140 |
| 13 | -282726877353 |
| 14 | -2661820464144 |
| 15 | -25135733453455 |
| 16 | -238021558244735 |
| 17 | -2259761800241599 |
| 18 | -21505250733431118 |
[2,5,-30,-411,-4698,-45824,-428661,-4000209, -37149512,-345401797,-3220550623,-30125571140, -282726877353,-2661820464144,-25135733453455, -238021558244735,-2259761800241599, -21505250733431118] |