n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 11 |
7 | 28 |
8 | 78 |
9 | 212 |
10 | 598 |
11 | 1686 |
12 | 4841 |
13 | 13975 |
14 | 40777 |
15 | 119698 |
16 | 353905 |
17 | 1051948 |
18 | 3143582 |
19 | 9436033 |
20 | 28443340 |
21 | 86055366 |
22 | 261253380 |
23 | 795587214 |
24 | 2429692385 |
25 | 7439569568 |
26 | 22834518491 |
27 | 70243063795 |
28 | 216527666056 |
[1,1,1,2,4,11,28,78,212,598,1686,4841,13975,40777, 119698,353905,1051948,3143582,9436033,28443340, 86055366,261253380,795587214,2429692385, 7439569568,22834518491,70243063795,216527666056] |