n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 100 |
5 | 276 |
6 | 740 |
7 | 1972 |
8 | 5172 |
9 | 13492 |
10 | 34876 |
11 | 89764 |
12 | 229628 |
13 | 585508 |
14 | 1486308 |
15 | 3763460 |
16 | 9497380 |
17 | 23918708 |
18 | 60080156 |
19 | 150660388 |
20 | 377009364 |
21 | 942106116 |
22 | 2350157268 |
23 | 5855734740 |
24 | 14569318492 |
25 | 36212402548 |
26 | 89896870204 |
[1,4,12,36,100,276,740,1972,5172,13492,34876, 89764,229628,585508,1486308,3763460,9497380, 23918708,60080156,150660388,377009364,942106116, 2350157268,5855734740,14569318492,36212402548, 89896870204] |