n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 11 |
6 | 33 |
7 | 103 |
8 | 330 |
9 | 1077 |
10 | 3556 |
11 | 11895 |
12 | 40187 |
13 | 137049 |
14 | 471070 |
15 | 1630819 |
16 | 5680854 |
17 | 19899698 |
18 | 70053093 |
19 | 247711242 |
20 | 879441789 |
21 | 3133648932 |
22 | 11202930544 |
23 | 40172365842 |
24 | 144453506494 |
25 | 520759972064 |
26 | 1881787195944 |
27 | 6814766134276 |
[1,1,1,2,4,11,33,103,330,1077,3556,11895,40187, 137049,471070,1630819,5680854,19899698,70053093, 247711242,879441789,3133648932,11202930544, 40172365842,144453506494,520759972064, 1881787195944,6814766134276] |