n | a(n) |
---|---|
1 | 2 |
2 | -3 |
3 | 2 |
4 | -3 |
5 | 6 |
6 | -11 |
7 | 18 |
8 | -30 |
9 | 56 |
10 | -105 |
11 | 186 |
12 | -335 |
13 | 630 |
14 | -1179 |
15 | 2182 |
16 | -4080 |
17 | 7710 |
18 | -14588 |
19 | 27594 |
20 | -52377 |
21 | 99858 |
22 | -190743 |
23 | 364722 |
24 | -698870 |
25 | 1342176 |
26 | -2581425 |
27 | 4971008 |
28 | -9586395 |
29 | 18512790 |
30 | -35792449 |
31 | 69273666 |
32 | -134215680 |
33 | 260300986 |
[2,-3,2,-3,6,-11,18,-30,56,-105,186,-335,630, -1179,2182,-4080,7710,-14588,27594,-52377,99858, -190743,364722,-698870,1342176,-2581425,4971008, -9586395,18512790,-35792449,69273666,-134215680, 260300986] |