n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 100 |
5 | 268 |
6 | 704 |
7 | 1812 |
8 | 4600 |
9 | 11556 |
10 | 28788 |
11 | 71252 |
12 | 175452 |
13 | 430284 |
14 | 1051848 |
15 | 2564708 |
16 | 6240752 |
17 | 15161092 |
18 | 36784284 |
19 | 89155268 |
20 | 215911636 |
21 | 522543436 |
22 | 1263991824 |
23 | 3056244212 |
24 | 7387384808 |
25 | 17851786148 |
26 | 43130479748 |
27 | 104187860340 |
28 | 251648811212 |
29 | 607755975820 |
30 | 1467673342616 |
[1,4,12,36,100,268,704,1812,4600,11556,28788, 71252,175452,430284,1051848,2564708,6240752, 15161092,36784284,89155268,215911636,522543436, 1263991824,3056244212,7387384808,17851786148, 43130479748,104187860340,251648811212, 607755975820,1467673342616] |