n | a(n) |
---|---|
3 | 1 |
4 | 2 |
5 | 6 |
6 | 20 |
7 | 40 |
8 | 106 |
9 | 304 |
10 | 731 |
11 | 1936 |
12 | 5769 |
13 | 14343 |
14 | 39583 |
15 | 117957 |
16 | 305576 |
17 | 855474 |
18 | 2565922 |
19 | 6793516 |
20 | 19242857 |
21 | 57827068 |
22 | 155681341 |
23 | 444461623 |
24 | 1337436721 |
25 | 3645877447 |
26 | 10471728930 |
27 | 31534868169 |
28 | 86818242806 |
29 | 250543852080 |
30 | 754851821246 |
31 | 2094887707000 |
[1,2,6,20,40,106,304,731,1936,5769,14343,39583, 117957,305576,855474,2565922,6793516,19242857, 57827068,155681341,444461623,1337436721, 3645877447,10471728930,31534868169,86818242806, 250543852080,754851821246,2094887707000] |