n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 0 |
3 | 2 |
4 | -12 |
5 | 44 |
6 | -216 |
7 | 944 |
8 | -5296 |
9 | 27632 |
10 | -168128 |
11 | 975072 |
12 | -5391680 |
13 | 27882048 |
14 | 38412672 |
15 | -1986004224 |
16 | 61881368832 |
17 | -850359527680 |
18 | 16576603568128 |
19 | -222801125934592 |
20 | 4120672559178752 |
21 | -57863671042155520 |
[1,-1,0,2,-12,44,-216,944,-5296,27632,-168128, 975072,-5391680,27882048,38412672,-1986004224, 61881368832,-850359527680,16576603568128, -222801125934592,4120672559178752, -57863671042155520] |