n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 15 |
6 | 44 |
7 | 140 |
8 | 442 |
9 | 1443 |
10 | 4751 |
11 | 15903 |
12 | 53716 |
13 | 183334 |
14 | 630513 |
15 | 2184417 |
16 | 7614318 |
17 | 26690344 |
18 | 94015908 |
19 | 332639104 |
20 | 1181596784 |
21 | 4212424485 |
22 | 15066677338 |
23 | 54050993664 |
24 | 194438337125 |
25 | 701224890628 |
26 | 2534810109024 |
[1,1,1,2,5,15,44,140,442,1443,4751,15903,53716, 183334,630513,2184417,7614318,26690344,94015908, 332639104,1181596784,4212424485,15066677338, 54050993664,194438337125,701224890628, 2534810109024] |