n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 3 |
3 | 9 |
4 | 39 |
5 | 189 |
6 | 981 |
7 | 5490 |
8 | 31674 |
9 | 189954 |
10 | 1170126 |
11 | 7382745 |
12 | 47494197 |
13 | 310712808 |
14 | 2061987642 |
15 | 13855192866 |
16 | 94113385437 |
17 | 645424668666 |
18 | 4464027720900 |
19 | 31110200069511 |
20 | 218292811705458 |
21 | 1541172223659249 |
[1,3,3,9,39,189,981,5490,31674,189954,1170126, 7382745,47494197,310712808,2061987642,13855192866, 94113385437,645424668666,4464027720900, 31110200069511,218292811705458,1541172223659249] |