n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | 0 |
4 | 6 |
5 | -30 |
6 | 90 |
7 | 0 |
8 | -2520 |
9 | 22680 |
10 | -113400 |
11 | 0 |
12 | 7484400 |
13 | -97297200 |
14 | 681080400 |
15 | 0 |
16 | -81729648000 |
17 | 1389404016000 |
18 | -12504636144000 |
19 | 0 |
20 | 2375880867360000 |
21 | -49893498214560000 |
22 | 548828480360160000 |
23 | 0 |
24 | -151476660579404160000 |
[0,1,-1,0,6,-30,90,0,-2520,22680,-113400,0, 7484400,-97297200,681080400,0,-81729648000, 1389404016000,-12504636144000,0,2375880867360000, -49893498214560000,548828480360160000,0, -151476660579404160000] |