n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 8 |
4 | 19 |
5 | 51 |
6 | 141 |
7 | 392 |
8 | 1079 |
9 | 2957 |
10 | 8072 |
11 | 21987 |
12 | 59825 |
13 | 162695 |
14 | 442342 |
15 | 1202521 |
16 | 3268920 |
17 | 8885999 |
18 | 24154826 |
19 | 65659826 |
20 | 178482140 |
[2,4,8,19,51,141,392,1079,2957,8072,21987,59825, 162695,442342,1202521,3268920,8885999,24154826, 65659826,178482140] |