n | a(n) |
---|---|
1 | 1 |
2 | 9 |
3 | 55 |
4 | 345 |
5 | 2251 |
6 | 15183 |
7 | 104959 |
8 | 739161 |
9 | 5280931 |
10 | 38165259 |
11 | 278415919 |
12 | 2046924399 |
13 | 15148345759 |
14 | 112738423359 |
15 | 843126957055 |
16 | 6332299624281 |
17 | 47737325577619 |
18 | 361077477684435 |
19 | 2739270870994735 |
20 | 20836827035351595 |
[1,9,55,345,2251,15183,104959,739161,5280931, 38165259,278415919,2046924399,15148345759, 112738423359,843126957055,6332299624281, 47737325577619,361077477684435,2739270870994735, 20836827035351595] |