n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 16 |
5 | 45 |
6 | 126 |
7 | 356 |
8 | 1008 |
9 | 2862 |
10 | 8140 |
11 | 23188 |
12 | 66144 |
13 | 188916 |
14 | 540216 |
15 | 1546560 |
16 | 4432512 |
17 | 12717513 |
18 | 36526626 |
19 | 105016686 |
20 | 302228080 |
21 | 870613689 |
22 | 2510249302 |
23 | 7244285436 |
24 | 20924179920 |
25 | 60487084775 |
26 | 174994990326 |
27 | 506669921982 |
[1,2,6,16,45,126,356,1008,2862,8140,23188,66144, 188916,540216,1546560,4432512,12717513,36526626, 105016686,302228080,870613689,2510249302, 7244285436,20924179920,60487084775,174994990326, 506669921982] |