n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 18 |
4 | 60 |
5 | 200 |
6 | 700 |
7 | 2450 |
8 | 8820 |
9 | 31752 |
10 | 116424 |
11 | 426888 |
12 | 1585584 |
13 | 5889312 |
14 | 22084920 |
15 | 82818450 |
16 | 312869700 |
17 | 1181952200 |
18 | 4491418360 |
19 | 17067389768 |
20 | 65166397296 |
21 | 248817153312 |
22 | 953799087696 |
23 | 3656229836168 |
24 | 14062422446800 |
25 | 54086240180000 |
26 | 208618354980000 |
[1,2,6,18,60,200,700,2450,8820,31752,116424, 426888,1585584,5889312,22084920,82818450, 312869700,1181952200,4491418360,17067389768, 65166397296,248817153312,953799087696, 3656229836168,14062422446800,54086240180000, 208618354980000] |