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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -2 |
| 3 | -7 |
| 4 | -54 |
| 5 | -544 |
| 6 | -7005 |
| 7 | -108220 |
| 8 | -1958263 |
| 9 | -40629205 |
| 10 | -951376217 |
| 11 | -24826365255 |
| 12 | -714568797261 |
| 13 | -22491957589783 |
| 14 | -768651303338761 |
| 15 | -28344950796904518 |
| 16 | -1121910285249842486 |
| 17 | -47442295013058570884 |
| 18 | -2134673855370621621400 |
[1,-1,-2,-7,-54,-544,-7005,-108220,-1958263, -40629205,-951376217,-24826365255,-714568797261, -22491957589783,-768651303338761, -28344950796904518,-1121910285249842486, -47442295013058570884,-2134673855370621621400] |