n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 50 |
6 | 191 |
7 | 795 |
8 | 3625 |
9 | 17781 |
10 | 93319 |
11 | 519732 |
12 | 3056185 |
13 | 18880345 |
14 | 122066437 |
15 | 823118881 |
16 | 5772473719 |
17 | 41995743085 |
18 | 316258151517 |
19 | 2460542117337 |
20 | 19743544526463 |
21 | 163138014893817 |
22 | 1386173917051704 |
23 | 12096681529032989 |
24 | 108293699332498981 |
[1,1,2,5,15,50,191,795,3625,17781,93319,519732, 3056185,18880345,122066437,823118881,5772473719, 41995743085,316258151517,2460542117337, 19743544526463,163138014893817,1386173917051704, 12096681529032989,108293699332498981] |