| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -3 |
| 3 | 11 |
| 4 | -58 |
| 5 | 409 |
| 6 | -3606 |
| 7 | 38149 |
| 8 | -470856 |
| 9 | 6641793 |
| 10 | -105398650 |
| 11 | 1858413061 |
| 12 | -36044759796 |
| 13 | 762659322385 |
| 14 | -17481598316742 |
| 15 | 431535346662645 |
| 16 | -11413394655983536 |
| 17 | 321989729198400385 |
| 18 | -9651573930139850610 |
[0,1,-3,11,-58,409,-3606,38149,-470856,6641793, -105398650,1858413061,-36044759796,762659322385, -17481598316742,431535346662645, -11413394655983536,321989729198400385, -9651573930139850610] |