n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 80 |
7 | 366 |
8 | 1897 |
9 | 10976 |
10 | 70155 |
11 | 490930 |
12 | 3733246 |
13 | 30655152 |
14 | 270334766 |
15 | 2548153230 |
16 | 25566585450 |
17 | 272052199520 |
18 | 3060191748695 |
19 | 36282298766760 |
20 | 452220051658265 |
21 | 5911274512571280 |
22 | 80862988937379390 |
23 | 1155309461910323610 |
24 | 17208404375488550100 |
[1,2,6,20,80,366,1897,10976,70155,490930,3733246, 30655152,270334766,2548153230,25566585450, 272052199520,3060191748695,36282298766760, 452220051658265,5911274512571280, 80862988937379390,1155309461910323610, 17208404375488550100] |