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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | -2 |
| 3 | -6 |
| 4 | -24 |
| 5 | -114 |
| 6 | -606 |
| 7 | -3486 |
| 8 | -21258 |
| 9 | -135582 |
| 10 | -896046 |
| 11 | -6095490 |
| 12 | -42470280 |
| 13 | -301938390 |
| 14 | -2183873490 |
| 15 | -16032229362 |
| 16 | -119232361656 |
| 17 | -896918310126 |
| 18 | -6815685210078 |
| 19 | -52262898201642 |
| 20 | -404022890110872 |
| 21 | -3146342571901278 |
| 22 | -24666061437979938 |
| 23 | -194550540203413314 |
[1,-2,-2,-6,-24,-114,-606,-3486,-21258,-135582, -896046,-6095490,-42470280,-301938390,-2183873490, -16032229362,-119232361656,-896918310126, -6815685210078,-52262898201642,-404022890110872, -3146342571901278,-24666061437979938, -194550540203413314] |