n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 2 |
3 | -4 |
4 | 12 |
5 | -36 |
6 | 128 |
7 | -456 |
8 | 1872 |
9 | -7888 |
10 | 37600 |
11 | -184064 |
12 | 990784 |
13 | -5444544 |
14 | 32333824 |
15 | -195982208 |
16 | 1272660224 |
17 | -8441139456 |
18 | 59527313920 |
19 | -428299217920 |
20 | 3252626013184 |
21 | -25165446157312 |
22 | 204354574172160 |
23 | -1689266143553536 |
[1,-1,2,-4,12,-36,128,-456,1872,-7888,37600, -184064,990784,-5444544,32333824,-195982208, 1272660224,-8441139456,59527313920,-428299217920, 3252626013184,-25165446157312,204354574172160, -1689266143553536] |