n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | -2 |
3 | 6 |
4 | -28 |
5 | 260 |
6 | -3948 |
7 | 71120 |
8 | -1392368 |
9 | 29971008 |
10 | -724981920 |
11 | 19800726528 |
12 | -603571233120 |
13 | 20210951379840 |
14 | -734663902256256 |
15 | 28785160833254400 |
16 | -1210241780559067392 |
17 | 54390280325210271744 |
18 | -2602745536670709682176 |
19 | 132118736078618372579328 |
[1,1,-2,6,-28,260,-3948,71120,-1392368,29971008, -724981920,19800726528,-603571233120, 20210951379840,-734663902256256,28785160833254400, -1210241780559067392,54390280325210271744, -2602745536670709682176,132118736078618372579328] |