n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 75 |
6 | 295 |
7 | 1575 |
8 | 7196 |
9 | 48993 |
10 | 230413 |
11 | 2164767 |
12 | 8055938 |
13 | 139431149 |
14 | 70125991 |
15 | 14201296057 |
16 | -77573062280 |
17 | 2389977322593 |
18 | -28817693086263 |
19 | 615493949444827 |
20 | -10403976760589602 |
21 | 215611836994976237 |
[1,1,2,6,18,75,295,1575,7196,48993,230413,2164767, 8055938,139431149,70125991,14201296057, -77573062280,2389977322593,-28817693086263, 615493949444827,-10403976760589602, 215611836994976237] |