n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | 0 |
4 | 2 |
5 | -20 |
6 | 104 |
7 | -560 |
8 | 2512 |
9 | -7920 |
10 | -32896 |
11 | 1034880 |
12 | -14979328 |
13 | 172569280 |
14 | -1684304896 |
15 | 12339608320 |
16 | -15173408768 |
17 | -1902800305920 |
18 | 53242752303104 |
19 | -1037015219466240 |
20 | 16518488951816192 |
21 | -208832669083243520 |
[0,1,-1,0,2,-20,104,-560,2512,-7920,-32896, 1034880,-14979328,172569280,-1684304896, 12339608320,-15173408768,-1902800305920, 53242752303104,-1037015219466240, 16518488951816192,-208832669083243520] |