n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | -1 |
3 | 21 |
4 | -111 |
5 | -345 |
6 | 14895 |
7 | -143955 |
8 | -760095 |
9 | 49774095 |
10 | -699437025 |
11 | -5221460475 |
12 | 458621111025 |
13 | -8457966542025 |
14 | -81662774418225 |
15 | 8999266227076125 |
16 | -205480756062957375 |
17 | -2434383666448358625 |
18 | 322739182334471277375 |
19 | -8786388514658364484875 |
[1,-1,-1,21,-111,-345,14895,-143955,-760095, 49774095,-699437025,-5221460475,458621111025, -8457966542025,-81662774418225,8999266227076125, -205480756062957375,-2434383666448358625, 322739182334471277375,-8786388514658364484875] |