n | a(n) |
---|---|
0 | 1 |
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 | 190899321 |
15 | 1382958475 |
16 | 10480139391 |
17 | 82864788832 |
18 | 682074818390 |
19 | 5832698911490 |
[1,1,2,5,15,52,203,877,4140,21147,115975,678570, 4213597,27644437,190899321,1382958475,10480139391, 82864788832,682074818390,5832698911490] |