n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 51 |
8 | 128 |
9 | 345 |
10 | 940 |
11 | 2632 |
12 | 7450 |
13 | 21434 |
14 | 62174 |
15 | 182146 |
16 | 537369 |
17 | 1596133 |
18 | 4767379 |
19 | 14312919 |
20 | 43162856 |
21 | 130695821 |
22 | 397184252 |
23 | 1211057426 |
24 | 3703794849 |
25 | 11358759346 |
26 | 34923477315 |
27 | 107627138308 |
28 | 332404636811 |
[1,1,2,4,9,20,51,128,345,940,2632,7450,21434, 62174,182146,537369,1596133,4767379,14312919, 43162856,130695821,397184252,1211057426, 3703794849,11358759346,34923477315,107627138308, 332404636811] |