n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 12 |
4 | 36 |
5 | 102 |
6 | 296 |
7 | 856 |
8 | 2472 |
9 | 7146 |
10 | 20652 |
11 | 59684 |
12 | 172492 |
13 | 498510 |
14 | 1440720 |
15 | 4163760 |
16 | 12033488 |
17 | 34777426 |
18 | 100508628 |
19 | 290475324 |
20 | 839489268 |
21 | 2426169014 |
22 | 7011758584 |
23 | 20264358408 |
24 | 58565082744 |
25 | 169256230458 |
26 | 489159584636 |
27 | 1413697437268 |
[2,4,12,36,102,296,856,2472,7146,20652,59684, 172492,498510,1440720,4163760,12033488,34777426, 100508628,290475324,839489268,2426169014, 7011758584,20264358408,58565082744,169256230458, 489159584636,1413697437268] |