n | a(n) |
---|---|
1 | 3 |
2 | -6 |
3 | 8 |
4 | -18 |
5 | 48 |
6 | -124 |
7 | 312 |
8 | -810 |
9 | 2184 |
10 | -5928 |
11 | 16104 |
12 | -44220 |
13 | 122640 |
14 | -341796 |
15 | 956576 |
16 | -2690010 |
17 | 7596480 |
18 | -21524412 |
19 | 61171656 |
20 | -174336264 |
21 | 498111952 |
22 | -1426419852 |
23 | 4093181688 |
24 | -11767874940 |
25 | 33891544368 |
26 | -97764131640 |
[3,-6,8,-18,48,-124,312,-810,2184,-5928,16104, -44220,122640,-341796,956576,-2690010,7596480, -21524412,61171656,-174336264,498111952, -1426419852,4093181688,-11767874940,33891544368, -97764131640] |