n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 23 |
6 | 63 |
7 | 177 |
8 | 514 |
9 | 1527 |
10 | 4625 |
11 | 14230 |
12 | 44357 |
13 | 139779 |
14 | 444558 |
15 | 1425151 |
16 | 4600339 |
17 | 14939849 |
18 | 48778197 |
19 | 160019885 |
20 | 527200711 |
[1,2,4,9,23,63,177,514,1527,4625,14230,44357, 139779,444558,1425151,4600339,14939849,48778197, 160019885,527200711] |