n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 19 |
5 | 61 |
6 | 216 |
7 | 789 |
8 | 2960 |
9 | 11439 |
10 | 45114 |
11 | 180779 |
12 | 735676 |
13 | 3030120 |
14 | 12613335 |
15 | 53004791 |
16 | 224550436 |
17 | 958227715 |
18 | 4115750849 |
19 | 17780103175 |
20 | 77214818728 |
21 | 336921319180 |
22 | 1476478558914 |
23 | 6495954222412 |
24 | 28683344656932 |
25 | 127075652153227 |
26 | 564718190262450 |
27 | 2516734088100503 |
28 | 11245821481990912 |
[1,1,2,6,19,61,216,789,2960,11439,45114,180779, 735676,3030120,12613335,53004791,224550436, 958227715,4115750849,17780103175,77214818728, 336921319180,1476478558914,6495954222412, 28683344656932,127075652153227,564718190262450, 2516734088100503,11245821481990912] |