n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 3 |
4 | 5 |
5 | 6 |
6 | 12 |
7 | 35 |
8 | 83 |
9 | 231 |
10 | 918 |
11 | 2132 |
12 | 7575 |
13 | 42734 |
14 | 132320 |
15 | 609928 |
16 | 4694085 |
17 | 18109624 |
18 | 113969565 |
19 | 1148801096 |
20 | 6065910343 |
21 | 51213901318 |
[1,2,2,3,5,6,12,35,83,231,918,2132,7575,42734, 132320,609928,4694085,18109624,113969565, 1148801096,6065910343,51213901318] |