n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 12 |
6 | 33 |
7 | 90 |
8 | 261 |
9 | 766 |
10 | 2312 |
11 | 7068 |
12 | 21965 |
13 | 68954 |
14 | 218751 |
15 | 699534 |
16 | 2253676 |
17 | 7305788 |
18 | 23816743 |
19 | 78023602 |
20 | 256738751 |
21 | 848152864 |
22 | 2811996972 |
23 | 9353366564 |
24 | 31204088381 |
25 | 104384620070 |
26 | 350064856815 |
27 | 1176693361956 |
28 | 3963752002320 |
[1,1,2,5,12,33,90,261,766,2312,7068,21965,68954, 218751,699534,2253676,7305788,23816743,78023602, 256738751,848152864,2811996972,9353366564, 31204088381,104384620070,350064856815, 1176693361956,3963752002320] |