n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 26 |
6 | 74 |
7 | 218 |
8 | 672 |
9 | 2134 |
10 | 6964 |
11 | 23206 |
12 | 78724 |
13 | 271014 |
14 | 944766 |
15 | 3328872 |
16 | 11838378 |
17 | 42441326 |
18 | 153236900 |
19 | 556746772 |
20 | 2034098988 |
[1,1,2,4,10,26,74,218,672,2134,6964,23206,78724, 271014,944766,3328872,11838378,42441326,153236900, 556746772,2034098988] |