n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 22 |
4 | 125 |
5 | 717 |
6 | 4121 |
7 | 23690 |
8 | 136181 |
9 | 782826 |
10 | 4500021 |
11 | 25868076 |
12 | 148700951 |
13 | 854797731 |
14 | 4913749086 |
15 | 28246366671 |
16 | 162372399730 |
17 | 933387168180 |
18 | 5365515365948 |
19 | 30843315747327 |
20 | 177300792451846 |
21 | 1019202061854748 |
[2,4,22,125,717,4121,23690,136181,782826,4500021, 25868076,148700951,854797731,4913749086, 28246366671,162372399730,933387168180, 5365515365948,30843315747327,177300792451846, 1019202061854748] |