n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 50 |
6 | 224 |
7 | 1054 |
8 | 5121 |
9 | 25509 |
10 | 129591 |
11 | 668811 |
12 | 3496740 |
13 | 18481512 |
14 | 98585788 |
15 | 530068840 |
16 | 2869725800 |
17 | 15630429306 |
18 | 85589391884 |
19 | 470905310206 |
20 | 2601941245750 |
21 | 14432082902820 |
22 | 80328808797750 |
23 | 448527122885700 |
24 | 2511672193514250 |
[1,1,3,12,50,224,1054,5121,25509,129591,668811, 3496740,18481512,98585788,530068840,2869725800, 15630429306,85589391884,470905310206, 2601941245750,14432082902820,80328808797750, 448527122885700,2511672193514250] |