n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 8 |
4 | 32 |
5 | 122 |
6 | 416 |
7 | 1414 |
8 | 4626 |
9 | 14930 |
10 | 47432 |
11 | 149032 |
12 | 463918 |
13 | 1432956 |
14 | 4397436 |
15 | 13419434 |
16 | 40754026 |
17 | 123245234 |
18 | 371322718 |
19 | 1115052844 |
20 | 3338521720 |
21 | 9969125698 |
22 | 29697147320 |
23 | 88271949298 |
24 | 261856896380 |
25 | 775373941754 |
26 | 2292071140404 |
[0,2,8,32,122,416,1414,4626,14930,47432,149032, 463918,1432956,4397436,13419434,40754026, 123245234,371322718,1115052844,3338521720, 9969125698,29697147320,88271949298,261856896380, 775373941754,2292071140404] |