n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | -1 |
3 | 0 |
4 | -1 |
5 | 1 |
6 | -3 |
7 | 6 |
8 | -15 |
9 | 36 |
10 | -91 |
11 | 232 |
12 | -603 |
13 | 1585 |
14 | -4213 |
15 | 11298 |
16 | -30537 |
17 | 83097 |
18 | -227475 |
19 | 625992 |
20 | -1730787 |
21 | 4805595 |
22 | -13393689 |
23 | 37458330 |
24 | -105089229 |
25 | 295673994 |
26 | -834086421 |
27 | 2358641376 |
28 | -6684761125 |
29 | 18985057351 |
30 | -54022715451 |
[1,-1,-1,0,-1,1,-3,6,-15,36,-91,232,-603,1585, -4213,11298,-30537,83097,-227475,625992,-1730787, 4805595,-13393689,37458330,-105089229,295673994, -834086421,2358641376,-6684761125,18985057351, -54022715451] |