n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 85 |
6 | 420 |
7 | 2443 |
8 | 16136 |
9 | 120222 |
10 | 993770 |
11 | 9042451 |
12 | 89725944 |
13 | 964693717 |
14 | 11168801294 |
15 | 138549935190 |
16 | 1833264311504 |
17 | 25773751694161 |
18 | 383664263687964 |
19 | 6028473673565695 |
20 | 99710105438401940 |
21 | 1731651866118338766 |
22 | 31505416776034601510 |
23 | 599259743707431667279 |
[1,1,2,6,20,85,420,2443,16136,120222,993770, 9042451,89725944,964693717,11168801294, 138549935190,1833264311504,25773751694161, 383664263687964,6028473673565695, 99710105438401940,1731651866118338766, 31505416776034601510,599259743707431667279] |