n | a(n) |
---|---|
1 | 4 |
2 | -6 |
3 | 20 |
4 | -66 |
5 | 204 |
6 | -670 |
7 | 2340 |
8 | -8226 |
9 | 29120 |
10 | -104754 |
11 | 381300 |
12 | -1398410 |
13 | 5162220 |
14 | -19172790 |
15 | 71582716 |
16 | -268439586 |
17 | 1010580540 |
18 | -3817733920 |
19 | 14467258260 |
20 | -54975633702 |
21 | 209430785460 |
22 | -799644629550 |
23 | 3059510616420 |
[4,-6,20,-66,204,-670,2340,-8226,29120,-104754, 381300,-1398410,5162220,-19172790,71582716, -268439586,1010580540,-3817733920,14467258260, -54975633702,209430785460,-799644629550, 3059510616420] |