n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 4140 |
9 | 21147 |
10 | 115975 |
11 | 678570 |
12 | 4213597 |
13 | 27644437 |
14 | 190899322 |
15 | 1382958545 |
16 | 10480142146 |
17 | 82864869667 |
18 | 682076796009 |
19 | 5832741665152 |
20 | 51724135127267 |
21 | 474868970216557 |
22 | 4506688232943076 |
23 | 44151191130412991 |
[1,2,5,15,52,203,877,4140,21147,115975,678570, 4213597,27644437,190899322,1382958545,10480142146, 82864869667,682076796009,5832741665152, 51724135127267,474868970216557,4506688232943076, 44151191130412991] |