n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 23 |
7 | 65 |
8 | 199 |
9 | 653 |
10 | 2275 |
11 | 8313 |
12 | 31439 |
13 | 121637 |
14 | 477307 |
15 | 1888721 |
16 | 7509799 |
17 | 29940861 |
18 | 119550419 |
19 | 477742889 |
20 | 1909988479 |
21 | 7637856725 |
22 | 30546970411 |
23 | 122178444417 |
24 | 488693854679 |
25 | 1954733475629 |
26 | 7818845822083 |
27 | 31275198738905 |
[1,1,2,4,9,23,65,199,653,2275,8313,31439,121637, 477307,1888721,7509799,29940861,119550419, 477742889,1909988479,7637856725,30546970411, 122178444417,488693854679,1954733475629, 7818845822083,31275198738905] |