n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 7 |
5 | 20 |
6 | 67 |
7 | 255 |
8 | 1080 |
9 | 5016 |
10 | 25249 |
11 | 136289 |
12 | 780658 |
13 | 4696002 |
14 | 29374011 |
15 | 189373083 |
16 | 1248978556 |
17 | 8376922028 |
18 | 56874440053 |
19 | 389553674037 |
20 | 2685020105574 |
21 | 18589701176694 |
22 | 129115803986575 |
23 | 898809701733551 |
24 | 6266899328414512 |
[1,2,3,7,20,67,255,1080,5016,25249,136289,780658, 4696002,29374011,189373083,1248978556,8376922028, 56874440053,389553674037,2685020105574, 18589701176694,129115803986575,898809701733551, 6266899328414512] |