n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | 3 |
4 | 0 |
5 | -30 |
6 | 90 |
7 | -630 |
8 | 0 |
9 | 22680 |
10 | -113400 |
11 | 1247400 |
12 | 0 |
13 | -97297200 |
14 | 681080400 |
15 | -10216206000 |
16 | 0 |
17 | 1389404016000 |
18 | -12504636144000 |
19 | 237588086736000 |
20 | 0 |
21 | -49893498214560000 |
22 | 548828480360160000 |
23 | -12623055048283680000 |
24 | 0 |
25 | 3786916514485104000000 |
[0,1,-1,3,0,-30,90,-630,0,22680,-113400,1247400,0, -97297200,681080400,-10216206000,0,1389404016000, -12504636144000,237588086736000,0, -49893498214560000,548828480360160000, -12623055048283680000,0,3786916514485104000000] |