n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 31 |
6 | 100 |
7 | 330 |
8 | 1093 |
9 | 3628 |
10 | 12049 |
11 | 40023 |
12 | 132951 |
13 | 441651 |
14 | 1467130 |
15 | 4873698 |
16 | 16190071 |
17 | 53782249 |
18 | 178660761 |
19 | 593498199 |
20 | 1971558339 |
[1,2,4,10,31,100,330,1093,3628,12049,40023,132951, 441651,1467130,4873698,16190071,53782249, 178660761,593498199,1971558339] |