n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 30 |
6 | 98 |
7 | 328 |
8 | 1140 |
9 | 4040 |
10 | 14542 |
11 | 53060 |
12 | 195624 |
13 | 727790 |
14 | 2728450 |
15 | 10296720 |
16 | 39084190 |
17 | 149115456 |
18 | 571504686 |
19 | 2199310460 |
20 | 8494701152 |
21 | 32919635606 |
22 | 127961125094 |
23 | 498775164568 |
24 | 1949112527750 |
25 | 7634623480172 |
[1,2,4,10,30,98,328,1140,4040,14542,53060,195624, 727790,2728450,10296720,39084190,149115456, 571504686,2199310460,8494701152,32919635606, 127961125094,498775164568,1949112527750, 7634623480172] |