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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | -3 |
| 4 | 0 |
| 5 | -10 |
| 6 | 88 |
| 7 | 336 |
| 8 | -5040 |
| 9 | 5256 |
| 10 | 202752 |
| 11 | -2094840 |
| 12 | 26943840 |
| 13 | -534147120 |
| 14 | 7877529840 |
| 15 | -41350410360 |
| 16 | -804692528640 |
| 17 | 16885512006720 |
| 18 | -166653340523520 |
| 19 | 3621340758072960 |
| 20 | -48704381263560960 |
| 21 | -2035821123825148800 |
| 22 | 99959690241598844160 |
| 23 | -1979439236443512264960 |
[2,-3,0,-10,88,336,-5040,5256,202752,-2094840, 26943840,-534147120,7877529840,-41350410360, -804692528640,16885512006720,-166653340523520, 3621340758072960,-48704381263560960, -2035821123825148800,99959690241598844160, -1979439236443512264960] |