n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 2 |
3 | -3 |
4 | 24 |
5 | -20 |
6 | 720 |
7 | -630 |
8 | 4480 |
9 | -36288 |
10 | 3628800 |
11 | -3326400 |
12 | 479001600 |
13 | -444787200 |
14 | 5811886080 |
15 | -81729648000 |
16 | 20922789888000 |
17 | -19760412672000 |
18 | 6402373705728000 |
19 | -6082255020441600 |
20 | 115852476579840000 |
21 | -2322315553259520000 |
22 | 1124000727777607680000 |
23 | -1077167364120207360000 |
[1,-1,2,-3,24,-20,720,-630,4480,-36288,3628800, -3326400,479001600,-444787200,5811886080, -81729648000,20922789888000,-19760412672000, 6402373705728000,-6082255020441600, 115852476579840000,-2322315553259520000, 1124000727777607680000,-1077167364120207360000] |