n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 136 |
4 | 600 |
5 | 2680 |
6 | 11448 |
7 | 47188 |
8 | 192612 |
9 | 779772 |
10 | 3142520 |
11 | 12628508 |
12 | 50661504 |
13 | 203032708 |
14 | 813165672 |
15 | 3255505980 |
[1,4,28,136,600,2680,11448,47188,192612,779772, 3142520,12628508,50661504,203032708,813165672, 3255505980] |