n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 2 |
4 | 6 |
5 | 22 |
6 | 80 |
7 | 296 |
8 | 1106 |
9 | 4166 |
10 | 15792 |
11 | 60172 |
12 | 230252 |
13 | 884236 |
14 | 3406104 |
15 | 13154948 |
16 | 50922986 |
17 | 197519942 |
18 | 767502944 |
19 | 2987013068 |
20 | 11641557716 |
21 | 45429853652 |
22 | 177490745984 |
23 | 694175171648 |
24 | 2717578296116 |
25 | 10648297329692 |
26 | 41757352712480 |
[1,0,2,6,22,80,296,1106,4166,15792,60172,230252, 884236,3406104,13154948,50922986,197519942, 767502944,2987013068,11641557716,45429853652, 177490745984,694175171648,2717578296116, 10648297329692,41757352712480] |