n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | -1 |
3 | 1 |
4 | -6 |
5 | 15 |
6 | -105 |
7 | 390 |
8 | -3500 |
9 | 15785 |
10 | -181125 |
11 | 807750 |
12 | -12261150 |
13 | 25793625 |
14 | -784508725 |
15 | -9327500000 |
16 | 54587949000 |
17 | -5375441316375 |
18 | 69535091676375 |
19 | -2529291250424250 |
20 | 40837337931958750 |
21 | -1268829193109066875 |
[0,0,-1,1,-6,15,-105,390,-3500,15785,-181125, 807750,-12261150,25793625,-784508725,-9327500000, 54587949000,-5375441316375,69535091676375, -2529291250424250,40837337931958750, -1268829193109066875] |