n | a(n) |
---|---|
1 | 1 |
2 | 5 |
3 | 15 |
4 | 46 |
5 | 140 |
6 | 420 |
7 | 1261 |
8 | 3785 |
9 | 11355 |
10 | 34066 |
11 | 102200 |
12 | 306600 |
13 | 919801 |
14 | 2759405 |
15 | 8278215 |
16 | 24834646 |
17 | 74503940 |
18 | 223511820 |
19 | 670535461 |
20 | 2011606385 |
21 | 6034819155 |
22 | 18104457466 |
23 | 54313372400 |
24 | 162940117200 |
25 | 488820351601 |
[1,5,15,46,140,420,1261,3785,11355,34066,102200, 306600,919801,2759405,8278215,24834646,74503940, 223511820,670535461,2011606385,6034819155, 18104457466,54313372400,162940117200,488820351601] |