n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 87 |
6 | 413 |
7 | 2213 |
8 | 13205 |
9 | 86828 |
10 | 623712 |
11 | 4859307 |
12 | 40810353 |
13 | 367525528 |
14 | 3532986232 |
15 | 36107260781 |
16 | 390938180027 |
17 | 4470065574970 |
18 | 53825174198772 |
19 | 680796406765054 |
20 | 9024180239004754 |
21 | 125096535241364056 |
22 | 1810074349321324370 |
23 | 27289548352480937756 |
[1,1,2,6,21,87,413,2213,13205,86828,623712, 4859307,40810353,367525528,3532986232,36107260781, 390938180027,4470065574970,53825174198772, 680796406765054,9024180239004754, 125096535241364056,1810074349321324370, 27289548352480937756] |