n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 3 |
6 | 7 |
7 | 18 |
8 | 48 |
9 | 133 |
10 | 373 |
11 | 1054 |
12 | 3011 |
13 | 8678 |
14 | 25216 |
15 | 73801 |
16 | 217476 |
17 | 644554 |
18 | 1920718 |
19 | 5750807 |
20 | 17293653 |
21 | 52208550 |
22 | 158179651 |
23 | 480806995 |
24 | 1465841157 |
25 | 4481166838 |
26 | 13733815975 |
27 | 42189399220 |
28 | 129883408346 |
[1,1,1,2,3,7,18,48,133,373,1054,3011,8678,25216, 73801,217476,644554,1920718,5750807,17293653, 52208550,158179651,480806995,1465841157, 4481166838,13733815975,42189399220,129883408346] |