n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 0 |
3 | 3 |
4 | -6 |
5 | 30 |
6 | 0 |
7 | -630 |
8 | 2520 |
9 | -22680 |
10 | 0 |
11 | 1247400 |
12 | -7484400 |
13 | 97297200 |
14 | 0 |
15 | -10216206000 |
16 | 81729648000 |
17 | -1389404016000 |
18 | 0 |
19 | 237588086736000 |
20 | -2375880867360000 |
21 | 49893498214560000 |
22 | 0 |
23 | -12623055048283680000 |
[1,-1,0,3,-6,30,0,-630,2520,-22680,0,1247400, -7484400,97297200,0,-10216206000,81729648000, -1389404016000,0,237588086736000, -2375880867360000,49893498214560000,0, -12623055048283680000] |