n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 0 |
3 | 2 |
4 | -2 |
5 | -6 |
6 | 16 |
7 | 20 |
8 | -132 |
9 | -28 |
10 | 1216 |
11 | -936 |
12 | -12440 |
13 | 23672 |
14 | 138048 |
15 | -469456 |
16 | -1601264 |
17 | 9112560 |
18 | 18108928 |
19 | -182135008 |
20 | -161934624 |
21 | 3804634784 |
22 | -404007680 |
23 | -83297957568 |
24 | 92590134208 |
25 | 1906560847424 |
26 | -4221314202624 |
27 | -45349267830400 |
28 | 159324751301248 |
[1,-1,0,2,-2,-6,16,20,-132,-28,1216,-936,-12440, 23672,138048,-469456,-1601264,9112560,18108928, -182135008,-161934624,3804634784,-404007680, -83297957568,92590134208,1906560847424, -4221314202624,-45349267830400,159324751301248] |