n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 8 |
4 | 25 |
5 | 73 |
6 | 234 |
7 | 717 |
8 | 2357 |
9 | 7480 |
10 | 25289 |
11 | 82837 |
12 | 289518 |
13 | 980017 |
14 | 3566993 |
15 | 12526980 |
16 | 47916421 |
17 | 175536777 |
18 | 712276698 |
19 | 2736099789 |
20 | 11863097885 |
21 | 47932689416 |
22 | 222692658177 |
23 | 946323358837 |
24 | 4700880455462 |
25 | 20946375415505 |
26 | 110626016074953 |
27 | 514550968010964 |
[1,1,3,8,25,73,234,717,2357,7480,25289,82837, 289518,980017,3566993,12526980,47916421,175536777, 712276698,2736099789,11863097885,47932689416, 222692658177,946323358837,4700880455462, 20946375415505,110626016074953,514550968010964] |