n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | -3 |
4 | 12 |
5 | -50 |
6 | 240 |
7 | -1330 |
8 | 8400 |
9 | -59580 |
10 | 468000 |
11 | -4018300 |
12 | 37237200 |
13 | -367507400 |
14 | 3802780800 |
15 | -40373385000 |
16 | 423927504000 |
17 | -4048235126000 |
18 | 25093796832000 |
19 | 288695417426000 |
20 | -18721925937000000 |
21 | 623644389813900000 |
[0,1,0,-3,12,-50,240,-1330,8400,-59580,468000, -4018300,37237200,-367507400,3802780800, -40373385000,423927504000,-4048235126000, 25093796832000,288695417426000,-18721925937000000, 623644389813900000] |