n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | -1 |
4 | 0 |
5 | -1 |
6 | 5 |
7 | -5 |
8 | 16 |
9 | -55 |
10 | 35 |
11 | -1045 |
12 | 64 |
13 | -30305 |
14 | 105 |
15 | -1242505 |
16 | 160 |
17 | -68337775 |
18 | 231 |
19 | -4851982025 |
20 | 320 |
21 | -431826400225 |
22 | 429 |
23 | -47069077624525 |
24 | 560 |
25 | -6166049168812775 |
26 | 715 |
27 | -955737621165980125 |
28 | 896 |
29 | -172988509431042402625 |
[0,1,-1,-1,0,-1,5,-5,16,-55,35,-1045,64,-30305, 105,-1242505,160,-68337775,231,-4851982025,320, -431826400225,429,-47069077624525,560, -6166049168812775,715,-955737621165980125,896, -172988509431042402625] |