n | a(n) |
---|---|
1 | 4 |
2 | 12 |
3 | 36 |
4 | 104 |
5 | 302 |
6 | 868 |
7 | 2490 |
8 | 7132 |
9 | 20424 |
10 | 58418 |
11 | 167036 |
12 | 477412 |
13 | 1364340 |
14 | 3898236 |
15 | 11138194 |
16 | 31824012 |
17 | 90926724 |
18 | 259790792 |
19 | 742259560 |
20 | 2120727868 |
21 | 6059178186 |
22 | 17311798890 |
23 | 49461883130 |
24 | 141318491362 |
25 | 403763748824 |
[4,12,36,104,302,868,2490,7132,20424,58418,167036, 477412,1364340,3898236,11138194,31824012,90926724, 259790792,742259560,2120727868,6059178186, 17311798890,49461883130,141318491362,403763748824] |