n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | -2 |
4 | -6 |
5 | -18 |
6 | -54 |
7 | -168 |
8 | -534 |
9 | -1732 |
10 | -5706 |
11 | -19038 |
12 | -64176 |
13 | -218190 |
14 | -747180 |
15 | -2574488 |
16 | -8918070 |
17 | -31036560 |
18 | -108457488 |
19 | -380390574 |
20 | -1338495492 |
21 | -4723664566 |
22 | -16714545822 |
23 | -59286878556 |
24 | -210755970528 |
25 | -750721297056 |
26 | -2679075662922 |
27 | -9577156141654 |
28 | -34290858526926 |
29 | -122959225609518 |
[1,0,0,-2,-6,-18,-54,-168,-534,-1732,-5706,-19038, -64176,-218190,-747180,-2574488,-8918070, -31036560,-108457488,-380390574,-1338495492, -4723664566,-16714545822,-59286878556, -210755970528,-750721297056,-2679075662922, -9577156141654,-34290858526926,-122959225609518] |