n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 1 |
4 | -2 |
5 | 6 |
6 | -18 |
7 | 57 |
8 | -186 |
9 | 622 |
10 | -2120 |
11 | 7338 |
12 | -25724 |
13 | 91144 |
14 | -325878 |
15 | 1174281 |
16 | -4260282 |
17 | 15548694 |
18 | -57048048 |
19 | 210295326 |
20 | -778483932 |
21 | 2892818244 |
22 | -10786724388 |
23 | 40347919626 |
24 | -151355847012 |
25 | 569274150156 |
[1,1,0,1,-2,6,-18,57,-186,622,-2120,7338,-25724, 91144,-325878,1174281,-4260282,15548694,-57048048, 210295326,-778483932,2892818244,-10786724388, 40347919626,-151355847012,569274150156] |