n | a(n) |
---|---|
1 | 4 |
2 | 10 |
3 | 38 |
4 | 90 |
5 | 366 |
6 | 878 |
7 | 3606 |
8 | 8666 |
9 | 35602 |
10 | 85550 |
11 | 351418 |
12 | 844394 |
13 | 3468498 |
14 | 8334126 |
15 | 34233910 |
16 | 82257450 |
17 | 337887294 |
18 | 811877790 |
19 | 3334934438 |
20 | 8013202282 |
21 | 32915673442 |
22 | 79089995358 |
23 | 324876418346 |
24 | 780615181818 |
25 | 3206517628418 |
26 | 7704641519326 |
[4,10,38,90,366,878,3606,8666,35602,85550,351418, 844394,3468498,8334126,34233910,82257450, 337887294,811877790,3334934438,8013202282, 32915673442,79089995358,324876418346,780615181818, 3206517628418,7704641519326] |