n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 9 |
4 | 19 |
5 | 51 |
6 | 177 |
7 | 747 |
8 | 3638 |
9 | 19691 |
10 | 115237 |
11 | 716530 |
12 | 4675989 |
13 | 31744547 |
14 | 222714791 |
15 | 1606590368 |
16 | 11868687555 |
17 | 89506353843 |
18 | 687275943030 |
19 | 5361745095952 |
20 | 42423407975227 |
21 | 339921277226567 |
22 | 2754682467870463 |
23 | 22553369649557926 |
24 | 186375668569345609 |
[2,4,9,19,51,177,747,3638,19691,115237,716530, 4675989,31744547,222714791,1606590368,11868687555, 89506353843,687275943030,5361745095952, 42423407975227,339921277226567,2754682467870463, 22553369649557926,186375668569345609] |