n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 100 |
5 | 284 |
6 | 780 |
7 | 2172 |
8 | 5916 |
9 | 16268 |
10 | 44100 |
11 | 120292 |
12 | 324932 |
13 | 881500 |
14 | 2374444 |
15 | 6416596 |
16 | 17245332 |
17 | 46466676 |
18 | 124658732 |
19 | 335116620 |
20 | 897697164 |
21 | 2408806028 |
22 | 6444560484 |
23 | 17266613812 |
24 | 46146397316 |
25 | 123481354908 |
26 | 329712786220 |
27 | 881317491628 |
[1,4,12,36,100,284,780,2172,5916,16268,44100, 120292,324932,881500,2374444,6416596,17245332, 46466676,124658732,335116620,897697164,2408806028, 6444560484,17266613812,46146397316,123481354908, 329712786220,881317491628] |