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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 2 |
| 3 | 21 |
| 4 | -104 |
| 5 | -8245 |
| 6 | -124344 |
| 7 | 7728581 |
| 8 | 757142912 |
| 9 | 21142327671 |
| 10 | -3194024271200 |
| 11 | -589138966169611 |
| 12 | -38768504982354432 |
| 13 | 4948651031184677219 |
| 14 | 2022468386748039472256 |
| 15 | 303711906641250589741125 |
| 16 | -7986432746850744238505984 |
| 17 | -19535207301291993249120303121 |
[1,-1,2,21,-104,-8245,-124344,7728581,757142912, 21142327671,-3194024271200,-589138966169611, -38768504982354432,4948651031184677219, 2022468386748039472256,303711906641250589741125, -7986432746850744238505984, -19535207301291993249120303121] |