n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | -1 |
5 | 3 |
6 | -3 |
7 | 6 |
8 | -15 |
9 | 58 |
10 | -64 |
11 | 198 |
12 | -476 |
13 | 1179 |
14 | -2907 |
15 | 8377 |
16 | -19917 |
17 | 69243 |
18 | -131621 |
19 | 379716 |
20 | -995100 |
21 | 2878526 |
22 | -7230486 |
23 | 21469716 |
24 | -54741166 |
25 | 156719748 |
26 | -417925683 |
27 | 1220839292 |
28 | -3221204589 |
29 | 9501389898 |
30 | -25010664810 |
31 | 73038583431 |
32 | -197176327311 |
33 | 595340630241 |
[1,1,1,-1,3,-3,6,-15,58,-64,198,-476,1179,-2907, 8377,-19917,69243,-131621,379716,-995100,2878526, -7230486,21469716,-54741166,156719748,-417925683, 1220839292,-3221204589,9501389898,-25010664810, 73038583431,-197176327311,595340630241] |