n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 15 |
4 | 60 |
5 | 260 |
6 | 1820 |
7 | 12376 |
8 | 136136 |
9 | 1514513 |
10 | 27261234 |
11 | 488605194 |
12 | 14169550626 |
13 | 411591708660 |
14 | 19344810307020 |
15 | 908637119420910 |
16 | 69056421075989160 |
17 | 5249543573067466872 |
18 | 645693859487298425256 |
19 | 79413089729752455762384 |
20 | 15803204856220738696714416 |
[1,2,6,15,60,260,1820,12376,136136,1514513, 27261234,488605194,14169550626,411591708660, 19344810307020,908637119420910,69056421075989160, 5249543573067466872,645693859487298425256, 79413089729752455762384, 15803204856220738696714416] |