n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 10 |
6 | 24 |
7 | 66 |
8 | 173 |
9 | 498 |
10 | 1378 |
11 | 4070 |
12 | 11680 |
13 | 35078 |
14 | 103292 |
15 | 313980 |
16 | 942133 |
17 | 2890878 |
18 | 8798182 |
19 | 27204516 |
20 | 83704806 |
21 | 260493354 |
22 | 808445448 |
23 | 2529836520 |
24 | 7906101138 |
25 | 24858833998 |
26 | 78131339008 |
27 | 246694899708 |
28 | 779057755912 |
[1,1,2,4,10,24,66,173,498,1378,4070,11680,35078, 103292,313980,942133,2890878,8798182,27204516, 83704806,260493354,808445448,2529836520, 7906101138,24858833998,78131339008,246694899708, 779057755912] |