n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 40 |
5 | 129 |
6 | 540 |
7 | 1897 |
8 | 8246 |
9 | 30665 |
10 | 135859 |
11 | 524585 |
12 | 2358632 |
13 | 9347568 |
14 | 42477772 |
15 | 171734447 |
16 | 786713158 |
17 | 3229974119 |
18 | 14891910671 |
19 | 61902473315 |
20 | 286878483816 |
21 | 1204680901628 |
22 | 5606781805948 |
23 | 23745404043392 |
24 | 110910037745343 |
25 | 473126392668984 |
26 | 2216586236663657 |
27 | 9514692779869440 |
[1,1,4,10,40,129,540,1897,8246,30665,135859, 524585,2358632,9347568,42477772,171734447, 786713158,3229974119,14891910671,61902473315, 286878483816,1204680901628,5606781805948, 23745404043392,110910037745343,473126392668984, 2216586236663657,9514692779869440] |