n | a(n) |
---|---|
1 | 1 |
2 | 8 |
3 | 65 |
4 | 520 |
5 | 4161 |
6 | 33288 |
7 | 266305 |
8 | 2130440 |
9 | 17043521 |
10 | 136348168 |
11 | 1090785345 |
12 | 8726282760 |
13 | 69810262081 |
14 | 558482096648 |
15 | 4467856773185 |
16 | 35742854185480 |
17 | 285942833483841 |
18 | 2287542667870728 |
19 | 18300341342965825 |
20 | 146402730743726600 |
[1,8,65,520,4161,33288,266305,2130440,17043521, 136348168,1090785345,8726282760,69810262081, 558482096648,4467856773185,35742854185480, 285942833483841,2287542667870728, 18300341342965825,146402730743726600] |