n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 8 |
5 | 20 |
6 | 60 |
7 | 181 |
8 | 584 |
9 | 1916 |
10 | 6476 |
11 | 22210 |
12 | 77416 |
13 | 272840 |
14 | 971640 |
15 | 3488925 |
16 | 12621168 |
17 | 45946156 |
18 | 168206604 |
19 | 618853270 |
20 | 2286974856 |
21 | 8485246456 |
22 | 31596023208 |
23 | 118037654258 |
24 | 442287721872 |
25 | 1661790513944 |
26 | 6259494791096 |
[1,1,2,3,8,20,60,181,584,1916,6476,22210,77416, 272840,971640,3488925,12621168,45946156,168206604, 618853270,2286974856,8485246456,31596023208, 118037654258,442287721872,1661790513944, 6259494791096] |