n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 18 |
3 | 54 |
4 | 150 |
5 | 426 |
6 | 1158 |
7 | 3204 |
8 | 8682 |
9 | 23724 |
10 | 64194 |
11 | 174378 |
12 | 470856 |
13 | 1274430 |
14 | 3434826 |
15 | 9272346 |
16 | 24953004 |
17 | 67230288 |
18 | 180705126 |
19 | 486152604 |
20 | 1305430884 |
21 | 3507947838 |
22 | 9412114986 |
23 | 25268587338 |
24 | 67752451146 |
25 | 181754458194 |
26 | 487060621596 |
27 | 1305761069730 |
28 | 3497441209182 |
[1,6,18,54,150,426,1158,3204,8682,23724,64194, 174378,470856,1274430,3434826,9272346,24953004, 67230288,180705126,486152604,1305430884, 3507947838,9412114986,25268587338,67752451146, 181754458194,487060621596,1305761069730, 3497441209182] |