n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 3 |
4 | 7 |
5 | 18 |
6 | 48 |
7 | 145 |
8 | 444 |
9 | 1393 |
10 | 4507 |
11 | 14759 |
12 | 49142 |
13 | 165317 |
14 | 562091 |
15 | 1925899 |
16 | 6647608 |
17 | 23092972 |
18 | 80660663 |
19 | 283138682 |
20 | 998248096 |
21 | 3533524793 |
22 | 12552572322 |
23 | 44737515682 |
24 | 159919954982 |
25 | 573214555207 |
26 | 2059779884427 |
[2,2,3,7,18,48,145,444,1393,4507,14759,49142, 165317,562091,1925899,6647608,23092972,80660663, 283138682,998248096,3533524793,12552572322, 44737515682,159919954982,573214555207, 2059779884427] |