n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 71 |
6 | 262 |
7 | 994 |
8 | 3852 |
9 | 15183 |
10 | 60686 |
11 | 245412 |
12 | 1002344 |
13 | 4129012 |
14 | 17135432 |
15 | 71575350 |
16 | 300690836 |
17 | 1269662127 |
18 | 5385593406 |
19 | 22938095326 |
20 | 98059308676 |
21 | 420610907183 |
22 | 1809690341366 |
23 | 7808145901068 |
24 | 33776362530776 |
[1,1,2,6,20,71,262,994,3852,15183,60686,245412, 1002344,4129012,17135432,71575350,300690836, 1269662127,5385593406,22938095326,98059308676, 420610907183,1809690341366,7808145901068, 33776362530776] |