n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 25 |
5 | 70 |
6 | 209 |
7 | 656 |
8 | 2137 |
9 | 7155 |
10 | 24447 |
11 | 84864 |
12 | 298374 |
13 | 1060151 |
14 | 3800365 |
15 | 13727145 |
16 | 49910870 |
17 | 182522747 |
18 | 670896855 |
19 | 2477250003 |
20 | 9184502747 |
21 | 34177467134 |
22 | 127606759053 |
23 | 477890336663 |
24 | 1794697782990 |
25 | 6757164079051 |
26 | 25501212956975 |
27 | 96450275088260 |
[1,2,4,10,25,70,209,656,2137,7155,24447,84864, 298374,1060151,3800365,13727145,49910870, 182522747,670896855,2477250003,9184502747, 34177467134,127606759053,477890336663, 1794697782990,6757164079051,25501212956975, 96450275088260] |