n | a(n) |
---|---|
0 | 1 |
1 | 21 |
2 | 135 |
3 | 889 |
4 | 5903 |
5 | 39389 |
6 | 263647 |
7 | 1768457 |
8 | 11880131 |
9 | 79895207 |
10 | 537729241 |
11 | 3621234957 |
12 | 24396753479 |
13 | 164414536077 |
14 | 1108268954317 |
15 | 7471720473245 |
16 | 50378750794147 |
17 | 339712511249557 |
18 | 2290882896563443 |
19 | 15449485988902675 |
[1,21,135,889,5903,39389,263647,1768457,11880131, 79895207,537729241,3621234957,24396753479, 164414536077,1108268954317,7471720473245, 50378750794147,339712511249557,2290882896563443, 15449485988902675] |