n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 20 |
5 | 65 |
6 | 206 |
7 | 679 |
8 | 2248 |
9 | 7569 |
10 | 25690 |
11 | 88055 |
12 | 303964 |
13 | 1056497 |
14 | 3693158 |
15 | 12977655 |
16 | 45813008 |
17 | 162400609 |
18 | 577843890 |
19 | 2063053991 |
20 | 7388487460 |
21 | 26535797729 |
22 | 95552015614 |
23 | 344897769991 |
24 | 1247685613272 |
[0,1,2,7,20,65,206,679,2248,7569,25690,88055, 303964,1056497,3693158,12977655,45813008, 162400609,577843890,2063053991,7388487460, 26535797729,95552015614,344897769991, 1247685613272] |