n | a(n) |
---|---|
2 | 1 |
3 | 3 |
4 | 9 |
5 | 28 |
6 | 84 |
7 | 246 |
8 | 714 |
9 | 2059 |
10 | 5917 |
11 | 16971 |
12 | 48633 |
13 | 139333 |
14 | 399267 |
15 | 1144669 |
16 | 3283839 |
17 | 9427981 |
18 | 27090715 |
19 | 77911897 |
20 | 224272499 |
21 | 646157234 |
22 | 1863317958 |
23 | 5377939756 |
24 | 15535195892 |
25 | 44913790501 |
26 | 129955421387 |
27 | 376313609029 |
[1,3,9,28,84,246,714,2059,5917,16971,48633,139333, 399267,1144669,3283839,9427981,27090715,77911897, 224272499,646157234,1863317958,5377939756, 15535195892,44913790501,129955421387,376313609029] |