n | a(n) |
---|---|
0 | 1 |
1 | -2 |
2 | 6 |
3 | -20 |
4 | 50 |
5 | 168 |
6 | -4732 |
7 | 54024 |
8 | -356670 |
9 | -1558040 |
10 | 106069172 |
11 | -2197188864 |
12 | 26605890220 |
13 | 22266781600 |
14 | -12120090377400 |
15 | 402165029201744 |
16 | -7732409047854318 |
17 | 38209542402620232 |
18 | 4126723132306766900 |
19 | -211906442415502467360 |
20 | 5955735723962955009156 |
[1,-2,6,-20,50,168,-4732,54024,-356670,-1558040, 106069172,-2197188864,26605890220,22266781600, -12120090377400,402165029201744,-7732409047854318, 38209542402620232,4126723132306766900, -211906442415502467360,5955735723962955009156] |