n | a(n) |
---|---|
0 | 3 |
1 | 6 |
2 | 16 |
3 | 56 |
4 | 216 |
5 | 856 |
6 | 3416 |
7 | 13656 |
8 | 54616 |
9 | 218456 |
10 | 873816 |
11 | 3495256 |
12 | 13981016 |
13 | 55924056 |
14 | 223696216 |
15 | 894784856 |
16 | 3579139416 |
17 | 14316557656 |
18 | 57266230616 |
19 | 229064922456 |
20 | 916259689816 |
[3,6,16,56,216,856,3416,13656,54616,218456,873816, 3495256,13981016,55924056,223696216,894784856, 3579139416,14316557656,57266230616,229064922456, 916259689816] |