n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 14 |
4 | 47 |
5 | 155 |
6 | 507 |
7 | 1652 |
8 | 5373 |
9 | 17460 |
10 | 56714 |
11 | 184183 |
12 | 598091 |
13 | 1942071 |
14 | 6305992 |
15 | 20475625 |
16 | 66484244 |
17 | 215873462 |
18 | 700937471 |
19 | 2275930827 |
20 | 7389902771 |
21 | 23994866364 |
22 | 77910846021 |
23 | 252974934692 |
24 | 821404463698 |
25 | 2667083556359 |
[1,4,14,47,155,507,1652,5373,17460,56714,184183, 598091,1942071,6305992,20475625,66484244, 215873462,700937471,2275930827,7389902771, 23994866364,77910846021,252974934692,821404463698, 2667083556359] |