n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 88 |
6 | 445 |
7 | 2676 |
8 | 18739 |
9 | 149920 |
10 | 1349289 |
11 | 13492900 |
12 | 148421911 |
13 | 1781062944 |
14 | 23153818285 |
15 | 324153456004 |
16 | 4862301840075 |
17 | 77796829441216 |
18 | 1322546100500689 |
19 | 23805829809012420 |
20 | 452310766371235999 |
21 | 9046215327424720000 |
22 | 189970521875919120021 |
[1,2,6,21,88,445,2676,18739,149920,1349289, 13492900,148421911,1781062944,23153818285, 324153456004,4862301840075,77796829441216, 1322546100500689,23805829809012420, 452310766371235999,9046215327424720000, 189970521875919120021] |