n | a(n) |
---|---|
0 | 1 |
1 | -2 |
2 | 7 |
3 | -36 |
4 | 246 |
5 | -2100 |
6 | 21510 |
7 | -257040 |
8 | 3510360 |
9 | -53933040 |
10 | 920694600 |
11 | -17288964000 |
12 | 354169292400 |
13 | -7859862410400 |
14 | 187846741882800 |
15 | -4810116703392000 |
16 | 131382125482608000 |
17 | -3812816394747360000 |
18 | 117159925012065936000 |
19 | -3800085546956707008000 |
20 | 129743036125975752480000 |
[1,-2,7,-36,246,-2100,21510,-257040,3510360, -53933040,920694600,-17288964000,354169292400, -7859862410400,187846741882800,-4810116703392000, 131382125482608000,-3812816394747360000, 117159925012065936000,-3800085546956707008000, 129743036125975752480000] |